Bug Fixes in R2026b Prerelease

The following software and documentation bugs are considered resolved in the prerelease. The bugs listed below may be of interest to customers, based on general use of our products. Return to this page for future updates.

 

Available in R2026b Prerelease

Product Record Bug Summary
Aerospace Blockset 3838670 Input port values for Aerospace Blockset Spacecraft Dynamics block delayed by one timestep during simulation
Aerospace Blockset 3997090 Aerospace Blockset Orbit Propagator block crashes MATLAB when Propagation method is set to Kepler (unperturbed) using variable-step solver in rapid accelerator mode or inside model reference in accelerator mode
Aerospace Blockset 4135888 Simple Variable Mass 3DOF (Wind Axes) block outputs incorrect mass property values for external acceleration computation in generated code
Aerospace Blockset 4139158 Solar radiation pressure (SRP) accelerations in generated code are inconsistent with simulation for Spacecraft Dynamics and Orbit Propagator blocks
C2000 Microcontroller Blockset 3669394 Enabling blocking mode in the UART Receive block for F29H85x has no effect on generated code
C2000 Microcontroller Blockset 3910552 IPC interrupt in CPU2 for F28P65x does not get triggered when data is sent from CPU1 to CPU2 through IPC
C2000 Microcontroller Blockset 4033768 On F29H85x devices, the Run interrupt service routine as atomic unit option in the Hardware Interrupt block has no effect. Interrupts remain non-preemptible even when the option is cleared.
C2000 Microcontroller Blockset 4123248 Running c2000setup in MATLAB on Linux results in an error and prevents the setup interface from launching
DDS Blockset 3978708 Live simulation errors and terminates for DDS models with a topic mapped to a struct containing uint8 elements
Deep Learning HDL Toolbox 3923562 getInt8ToSingleConversionExponent provides incorrect exponent when Layer input parameter is not provided.
Deep Learning HDL Toolbox 3930560 Output mismatch during quantization workflow for deep learning network with Sigmoid layer
Deep Learning Toolbox 3953512 Unable to save trainNetwork training plot as image
Deep Learning Toolbox 4201282 The predict function outputs dlarray objects that have singleton "U" (unspecified) dimensions with incorrect permutation
DO Qualification Kit 3924178 Batch-mode execution might fail when the qualification kit attempts to open or close kit live script file during project setup or teardown
DO Qualification Kit 4005130 Simulink Code Inspector kit does not contain a tool qualification test for the ASCII to String block
DO Qualification Kit 4064900 Invalid link in Section 4.5 of the Tool Qualification Plan for Simulink Check
DO Qualification Kit 4202240 Polyspace Code Prover Tool Qualification Plan contains statement with incorrect logic in Table FM.A-7 (9)
Embedded Coder 3627708 Code generated from models with cross-subsystem function call and are configured to reuse Data Store Memory block buffers might be incorrect
Embedded Coder 3796242 Hardware Setup in Embedded Coder Support Package for AMD SoC Devices reports error Running ARM application on hardware has failed
Embedded Coder 3803650 Generated code might be incorrect when subsystems meeting certain criteria include identical subsystems
Embedded Coder 3807594 Code generation assertion for models with Simulink Function blocks that contain C Function block that uses bus signals
Embedded Coder 3863116 MATLAB might crash, display an error message or the generated code might be incorrect for AUTOSAR Adaptive models configured for external mode simulation with logged messages
Embedded Coder 3880774 Logged signals in AUTOSAR models might lead to communication error in SIL or PIL simulation
Embedded Coder 3977246 Output ports connected to Terminate Function blocks might have incorrect numerical values during SIL/PIL simulations
Embedded Coder 3986354 Code generated from models containing Assignment and Reshape blocks might be incorrect
Embedded Coder 4058762 Structure with unused members generated for model with Merge blocks and using AUTOSAR target
Embedded Coder 4108544 Simulink models targeting the AURIX TC4x PPU with Default parameter behavior set to Inlined generate uninitialized const‑qualified invariant signals in VCCM, resulting in incorrect output
Embedded Coder 4109996 Step function with one or more combined input-output arguments, generated from a model configured for function prototype control, might produce incorrect results
Embedded Coder 4141480 Generated code might be incorrect for model with two connected conditional subsystems that are never simultaneously active
HDL Coder 2363136 Logic synthesis fails in HDL Workflow Advisor if your design needs more I/O pins than available on the Altera FPGA board.
HDL Coder 3542960 Data Type Conversion block that has input of single type and output of fixed-point may have HDL simulation mismatch for several integer rounding modes
HDL Coder 3798966 importhdl may fail with syntax error when HDL file is encoded in UTF-16 LE/BE, UTF-32 LE/BE, or UTF-8 with BOM.
HDL Coder 3846344 The Model Advisor check for the usage of standardized MATLAB function headers issues a warning for the Bit Concat block when it contains only a single input port.
HDL Coder 3847912 Unable to map tunable parameters in MATLAB System blocks to the target platform interface table
HDL Coder 3857578 Single-rate resource sharing of data-dependent candidates with latency can cause output mismatches when the oversampling budget is limited
HDL Coder 3870024 HDL Coder generates an additional HDL file for each Compare To Constant block inserted from the HDL Coder / Logic and Bit Operations library.
HDL Coder 3874556 Delay balancing fails with an error message about the atomic subsystem
HDL Coder 3890292 HDL Coder Workflow Advisor's post synthesis resource utilization report is not accurate
HDL Coder 3909538 hdlget_param returns an incorrect architecture value for the root subsystem within a referenced subsystem and marks the model as dirty.
HDL Coder 3910438 HDL Coder generates a warning for violating industry-standard rule CGSL-1.A.E.2 when the reset signal name is set to RST_N
HDL Coder 3914098 MATLAB crashes during automated fixed-point conversion when MATLB designs implement repleaseImpl methods in System objects.
HDL Coder 3926434 Disabling DistributedPipelining for subsystem with states or delays leads to validation model mismatches
HDL Coder 3926646 HDL code generation fails when you specify special characters in the values of the SynthesisAttributes property.
HDL Coder 3931786 Error occurs while using getFPGAHILSynthesisResults function due to incorrect validation of model names and Excel file path
HDL Coder 3932218 Older FIR Decimator block settings may not map correctly to new HDL parameters when opening models from R2023b or earlier.
HDL Coder 3951228 HDL Coder produces Native Floating Point code without utilizing the AMD floating-point library when targeting Vivado versions 2024.2 and 2025.1
HDL Coder 3954200 IP core register initial value is incorrect for bus elements with floating-point or complex data types
HDL Coder 3962014 IP core register initial value is incorrect for half data types
HDL Coder 3964610 Unexpected delay balancing error with Clock-Rate Pipelining and feedback loops that contain minimal pipelining
HDL Coder 3973854 Outport blocks in Enabled and Triggered Subsystems might not include logic for the Initial output parameter
HDL Coder 3978852 Inefficient HDL is generated for FIR Decimator and FIR Interpolator blocks due to missing coefficient symmetry optimization
HDL Coder 3978946 Loss of HDL block settings for SharingFactor when mapping old HDL block options to a newer release
HDL Coder 3979146 FIR Decimator block does not share resources for polyphase filter branches
HDL Coder 4037010 Microchip Libero fails to infer ECC‑enabled RAM when HDL Coder uses syn_ramstyle='ecc' and RAM initialization is enabled.
HDL Coder 4114796 HDL code generation for a Product block with more than two inputs fails with floating-point targets when inputs have mixed dimensions in element-wise mode
HDL Coder 4133964 With Boolean inputs, the generated HDL code for the Extract Bits block does not match the simulation results.
HDL Coder 4142268 Unable to program Kria SOM kits using HDL Coder or SoC Blockset workflows
HDL Coder 4142542 Legacy pipelining settings override new pipelining parameters in upgraded filter models.
IEC Certification Kit 4175414 MATLAB Test kit contains incorrect wording for MLT_PLG_CC_CR and MLTEST_E8
Industrial Communication Toolbox 3916592 Error while loading Simulink configuration when reopening a model with OPC UA blocks inside a subsystem
Mapping Toolbox 3404817 For projcrs objects, setting projection parameters can cause removal of other parameters
MATLAB 1173404 dateshift does not accept English day of week name
MATLAB 3037468 Creating MP4 files with VideoWriter on Apple Silicon might result in unexpected diagonal black lines in output video
MATLAB 3313073 Errors when creating a large number of figures (> 200) in a loop.
MATLAB 3517122 Creation and deletion of invisible figures can cause a memory leak in MATLAB resulting in a crash
MATLAB 3837422 exportapp and getframe functions produce blank output from inactive figures in tabbed containers
MATLAB 3844350 On macOS, MATLAB might terminate unexpectedly with the error base::sequence_manager::internal::WorkTracker::AssertHasWork()
MATLAB 3856656 MATLAB returns ambiguous result when converting text to an enumeration member if the text is a full, case-insensitive match for multiple members
MATLAB 3871516 On Windows, engEvalString of C Engine returns before the MATLAB command finishes running and the output is not sent to the buffer defined by engOutputBuffer
MATLAB 3898712 MATLAB on Apple Silicon might crash when calling the svd function
MATLAB 3909318 Class Diagram Viewer exports blank images
MATLAB 3920164 Using PRINT or WRITE function to display text in Fortran MEX functions crashes MATLAB
MATLAB 3929444 Setting a custom default figure position and using the zooming buttons in the Live Editor might cause MATLAB to crash
MATLAB 3937046 Opening multiple app files while App Designer is not running might cause MATLAB to crash
MATLAB 3966298 ifft2 can return incorrect results for N-D array inputs when the "symmetric" option is used
MATLAB 3985384 The Files panel may appear blank and unresponsive even upon changing folder
MATLAB 4041574 Calling an export function inside a loop might cause Live Script execution to hang
MATLAB 4054380 Dependency Analyzer fails to open and displays a generic error dialog
MATLAB 4084486 .NET Engine throws System.ObjectDisposedException when invoking a MATLAB function with a MATLABStruct
MATLAB 4099560 Changing variable type in Import Tool might cause MATLAB to crash
MATLAB 4100330 MATLAB error containing "CreateProcessW: The parameter is incorrect [system:87]" affects Python interface, mexhost, ROS Toolbox, Instrument Control Toolbox and Hardware Manager
MATLAB 4122704 listRequiredFiles and listImpactedFiles functions do not report Simulink Requirements dependencies correctly
MATLAB 4154316 Creating a data tip for large data might cause MATLAB to become unresponsive
MATLAB Coder 3681448 Assignment between objects that generalizes a class property
MATLAB Coder 3782324 Dictionary functions numEntries and isConfigured might return incorrect results for persistent dictionary or dictionary configured in a loop
MATLAB Coder 3894812 Function calls missing from loops when SIMD is enabled
MATLAB Coder 3894846 MATLAB might crash during code generation if MATLAB code performs file input or output operations
MATLAB Coder 3922306 Global variables are not synchorized for feval calls even when global synchronization is enabled
MATLAB Coder 3950222 Global variable stops synchronizing if an extrinsic function call occurs after a coder.ceval("-global",...) call
MATLAB Coder 3995528 Using coder.varsize to make a cell array homogeneous after the cell array's size is observed
MATLAB Coder 4151070 Incorrect cancellation of negative factor in inequalities during code generation
MATLAB Coder 4173116 When softmax is applied to a formatted dlarray that was constructed from a permuted dlarray, code generation may produce different results compared to MATLAB
MATLAB Coder 4233514 norm function with sparse inputs
Navigation Toolbox 3139107 Pure Pursuit Controller returns curvature, but it is incorrectly labeled as angular velocity
Optimization Toolbox 3929668 coneprog produces unreliable result when socConstraints.b is sparse
Polyspace Bug Finder 4075302 False Positive CWE‑119 reported when a pointer to one data type is cast to a pointer of an unrelated type
Polyspace Code Prover 3924694 Spurious red checks when Polyspace Code Prover analyzes code generated by Embedded Coder
Polyspace Code Prover 3932096 Incorrect interpretation of negative float zero during bit-level reinterpretation
Polyspace Code Prover 4007050 Polyspace Code Prover incorrectly reports a red check on function frexp() that is called using NaN or Inf values
Requirements Toolbox 4118744 Requirements Table blocks that use the duration operator might evaluate incorrectly in resettable subsystems
Signal Processing Toolbox 4051322 GPU Coder fails to generate CUDA code for hann due to undefined variable cast1
SimBiology 4015870 The plot function of ParameterConfidenceInterval shows the log likelihood curve instead of the profile likelihood curve
Simscape 3965336 MATLAB crashes if Input filtering time constant (in seconds) on a Simulink-PS Converter block is set to []
Simscape Electrical 4040956 Universal Motor block might return wrong answers if parameterized by AC rated power
Simscape Fluids 4036062 hydraulicToIsothermalLiquid function incorrectly converts Pilot-Operated Check Valve when Pressure control specification is Pressure differential (pX-pA)
Simscape Fluids 4047714 Enabling Opening dynamics in valves may result in simulation dynamics that are more rapid than expected
Simscape Fluids 4173042 Pipe (TL) block overestimates heat transfer rate when Cross-sectional geometry is Annular
Simscape Fluids 4204786 2-Way Directional Valve (TL) and 3-Way Directional Valve (TL) blocks do not model faults
Simulink 3266854 MATLAB might crash when accessing the code mappings of an AUTOSAR Classic model after removing a Simulink Function block
Simulink 3284360 Variables used to define Simscape block parameters may not be tunable in Simulink Compiler simulations
Simulink 3360679 MATLAB might crash when deleting Simulink blocks
Simulink 3484945 Providing Spectrum Analyzer block with fixed-point inputs might crash MATLAB
Simulink 3535330 MATLAB might crash during repeated accelerator mode simulations
Simulink 3624626 Invalid output port index error when trying to generate HDL code for referenced models have Block reduction or Conditional input branch execution enabled
Simulink 3731850 Model with From Spreadsheet block returns error in rapid accelerator mode when block parameter TreatFirstColumnAs is Data and data not monotonically increasing
Simulink 3750448 Initial value specified for Simulink.Signal object ignored during simulation
Simulink 3782914 Normal mode simulations might not honor tuning of Model block instance parameter values
Simulink 3803792 Mask initialization that queries bus hierarchy might cause Simulink to hang
Simulink 3816684 Fixed-point input to MinMax block might lead to wrong output for specific model code generation setting
Simulink 3862032 MATLAB may terminate unexpectedly when Simulink scopes are used with models that generate large amount of data.
Simulink 3873328 A Parameter Writer block inside a variant block may lead to incorrect initial values in the generated code
Simulink 3881068 Simulation of Model Exchange FMUs might produce incorrect outputs due to undetected continuous state changes
Simulink 3884058 Model block execution order might not follow specified priorities
Simulink 3894534 Charts and S-Functions produce incorrect time when used inside an aperiodic partition
Simulink 3900984 Parameter Writer block produces incorrect simulation results when writing to Stateflow block mapping or mask parameter
Simulink 3907112 Block mask of a MATLAB System block with invalid property value is removed when you load the model
Simulink 3909758 Parameter Writer block with EnableMemcpy on generates incorrect code when writing to multidimensional global variable
Simulink 3916712 Incorrect simulation and code generation results may occur when Parameter Writer block modifies the model argument value which is used a variant control of Simulink.VariantVariable in bottom model
Simulink 3932288 Incorrect simulation behavior when referencing an export-function model with HardwareBoardFeatureSet set to SoCBlockset
Simulink 3943272 JMAAB-B model with Model block referencing rate-based model and scheduling execution rates using Model block port produces incorrect simulation results
Simulink 3950318 MATLAB crashes if a model contains a referenced model configured to use a local solver and loads an initial state that was saved in structure format
Simulink 3953762 Closing a MATLAB session with unsaved subsystem reference files might cause MATLAB to crash
Simulink 3969294 Logging Simulink messages from an Inport block inside a nested virtual subsystem might produce empty results
Simulink 3974400 Incorrect Accelerator or SIL simulations with fast restart when changing the Simulink.VariantControl value of Simulink.VariantVariable objects in a data dictionary
Simulink 3978978 Incorrect results might occur for model with Permute Matrix block
Simulink 3981614 Simulink crashes during FMU simulation in Rapid Accelerator mode
Simulink 3983808 Model with HardwareBoardFeatureSet set to SoCBlockset generates incorrect code
Simulink 3986072 Incorrect results for rapid accelerator simulation of multirate models that include Vector Concatenate, Probe, or Merge blocks
Simulink 4009282 Initialization error when opening MATLAB Test Manager or Dashboards from UNC network path on Windows
Simulink 4011250 Uninitialized local variables may occur when a nested Variant Subsystem has its variant activation time set to update diagram analyze all choices
Simulink 4022150 Remove reset function and Remove disable function model configuration parameters allowed in invalid context
Simulink 4024232 Fast Restart with Scope increases memory usage and can skew measurements data when run in multiple simulations.
Simulink 4024258 Generated code might be incorrect when the model contains multiple instances of a reusable subsystem that includes Data Store Memory blocks and used as variant choices with Variant activation time set to code compile
Simulink 4026910 Incorrect output port dimensions for Multiport Switch block
Simulink 4036194 Missing icons in Root Inport Mapper for MATLAB running in MATLAB Proxy environment
Simulink 4044318 Enabled subsystem that outputs variable-size signal through virtual port generates incorrect code in rapid accelerator mode
Simulink 4090462 Incorrect cancelation of negative factor from inequality
Simulink 4090488 Dataflow domains using signal storage reuse might produce incorrect results
Simulink 4092072 Parameter Writer block that writes to base workspace variable used by export-function model might produce incorrect simulation results
Simulink 4099664 Plotting signals with many channels in Signal Editor might cause Signal Editor to hang
Simulink 4099972 Display block might show incorrect values in multi-instance normal mode models when decimation is used
Simulink 4101834 Simulink string inputs to C Caller or C Function blocks might produce incorrect results
Simulink 4109968 Flip block might generate incorrect output in multi-instance normal mode models
Simulink 4110444 exportToFMU might fail to generate FMU for models with variable-step solvers
Simulink 4134190 timetable enumeration values loaded from MAT file and plotted in Signal Editor might cause MATLAB to hang
Simulink 4142002 MATLAB might crash when a model calls function through function pointer in C Function block
Simulink 4192612 Simulink may not display correctly when used on multiple monitors with different scaling settings
Simulink Check 3936630 Sumulink Model Advisor returns incorrect row-major support information for From and Goto blocks
Simulink Coder 3384495 Export Function called by multiple callers via Mux generates incorrect code
Simulink Coder 3799338 Passing multiple arguments sharing same address to Simulink function causes over-optimization of function definition and incorrect simulation results
Simulink Coder 3882824 Code generator produces incorrect registration code for model reference hierarchies that use absolute time and reusable code interface packaging
Simulink Coder 3906028 TLC error occurs during code generation when a single generated code file exceeds 1 GB.
Simulink Coder 3920484 MATLAB crashes when you generate an ASAP2 (A2L) file for the models that contain standalone subsystems, whose input argument's Storage class property is set to auto/define.
Simulink Coder 3922658 Build failure or incorrect C-API code for rtwCAPI_DataTypeMap when fixed-point word lengths exceed the target hardware’s largest integer size.
Simulink Coder 3955688 Function Caller block in one model invokes a Simulink Function block in another model
Simulink Coder 3965364 External mode simulation with XCP-based transport for model configured with parameter Ignore test point signals selected might crash or stream incorrect data when logging elements of a nonvirtual bus
Simulink Coder 4012048 Code generated from a model with a Unit Delay block, and the initial condition of the input signal of the block is of type bus, might be incorrect
Simulink Coder 4067800 When a Variant Subsystem block contains a conditional subsystem connected to a Unit Delay or Memory block, the generated code might be incorrect
Simulink Coder 4088634 Generated code might contain extraneous structure type definitions for model configured for Simulink Code Inspector
Simulink Coder 4092600 When a nonzero IC block is connected to an input arguments of a MATLAB function that is also used as an output argument, the generated code might be incorrect
Simulink Coder 4100510 When an Assignment block in an Iterator Subsystem is connected exclusively to an Outport block with a specified Initial output value, the generated code might be incorrect
Simulink Coder 4116186 Generating code from a model containing blocks with initial condition of type unsigned integer might fail with an assertion error
Simulink Compiler 3821882 Simulation of Model Exchange FMU 3.0 might terminate unexpectedly
Simulink Design Verifier 3914260 Simulink Design Verifier ignores potential integer overflows in Shift Arithmetic blocks
Simulink Design Verifier 3966266 Defect checker may not run the intended checks when analysis is invoked from Configuration Parameter window.
Simulink Design Verifier 4099304 SLDV incorrectly excludes -tol from the left relational boundary interval [-tol, 0) and may report some satisfiable objectives to be unsatisfiable.
Simulink Design Verifier 4115338 MATLAB throws assertion warning when launching test generation analysis in Simulink Design Verifier.
Simulink PLC Coder 3950668 Model reference PLC codegen crash if the configset 'Use subsystem instance name as function block instance name' option selected
Simulink Test 3704122 Calling Simulink.findVars on model containing observer reference models might error
Simulink Test 3968124 Changing Variant Subsystem from MIL to SIL and running test case produces build failure
Simulink Test 4083586 Using time variable t in logical and temporal assessments might lead to incomplete evaluation
SoC Blockset 3805126 Connection to ZCU111 hardware board from SoC Builder fails due to unavailable network ports
SoC Blockset 3981396 SoC Builder System Report: Incorrect details for strobe registers
Stateflow 3274410 Stateflow might fail to take transitions using the rising, falling, or crossing edge detection keywords in continuous-time charts
Stateflow 3788866 Incorrect behavior when using temporal logic operators with events
Stateflow 3899838 Wrong indexing into nd-matrices in Stateflow charts or MATLAB Function blocks that use custom code with "Preserve Element Dimensions" enabled
Stateflow 3914110 Simulation Data Inspector shows incorrect logging information for Stateflow states
Stateflow 3961220 Stateflow charts may generate incorrect indexing code for multi-dimensional Data Store Memory with symbolic dimensions
Stateflow 4039984 SFEntryPathToHistoryDiag parameter choices none and warning do not function as expected
Stateflow 4050992 Greater than expressions that use the duration operator on the left hand side do not return true at the correct simulation step
Stateflow 4057272 Assertion error when generating code for chart containing history junctions with Stateflow object comments enabled
System Composer 4062280 MATLAB might crash when a model has either a Simulink subsystem reference or subsystem component behaviors that contain FMU blocks
System Composer 4190146 Architecture subsystem reference models with broken connectors might cause MATLAB to crash
System Identification Toolbox 4042586 Nonlinear ARX models that use certain types of custom regressors fail to simulate in Simulink.
System Identification Toolbox 4056254 Certain iddata objects created in MATLAB releases R2020b through R2024b fail to load in MATLAB R2025b.
System Identification Toolbox 4098098 Simulink models that use a sigmoid network based nonlinear ARX model fail to build using Simulink Coder.
UAV Toolbox 3959374 Flight Log Analyzer fails to import PX4 logs newer than 1.14
Wireless Testbench 3721180 Error on Linux due to missing libusb
Wireless Testbench 4259782 openExample download error for "Target NI USRP Radios" examples

R2026b Prerelease

Preview and test the next product release.


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Content updated: February 3, 2026