Spike 4.0.17 crashes during MATLAB Runtime R2021b initialization on Ubuntu 26.04

I’m trying to run Signal Hound Spike 4.0.17 on Ubuntu 26.04.1 LTS, but it crashes during MATLAB Runtime initialization when lte using.
Environment
– Computer: Dell Precision 3650, Intel x86-64
– OS: Ubuntu 26.04.1 LTS, GNOME/Wayland
– glibc: 2.43
– MATLAB Runtime: R2021b Update 8, version 9.11.0.2911900
– Runtime location: /usr/local/MATLAB/MATLAB_Runtime/v911

Assertion in insert at management.cpp line 401:
Type ‘(anonymous namespace)::FrameworkShutdownHolder’ already inserted

MATLAB is exiting because of fatal error

libmwfoundation_usm.so
mwCppMicroServicesShutdownHook.so
libmwstartup_plugin_initializer.so
libmwMVMLocal.so
libmwmvm.so
libmwmclbase.so → mclInitializeApplication
libspike_ml_api.so → SpikeMLInternalInitialize

Troubleshooting performed
1. Selected Qt’s xcb backend because the application only includes that platform plugin.
2. Added MATLAB Runtime directories to LD_LIBRARY_PATH.
3. Preloaded system FreeType to resolve the missing FT_Get_Color_Glyph_Layer symbol.
4. Preloaded system GLX and C++ libraries. Loader diagnostics confirmed that MATLAB’s bundled libstdc++.so.6 lacked GLIBCXX_3.4.26, which the system Mesa driver requires.
5. Cleared executable-stack flags on runtime libraries that blocked loading and on MATLAB startup plugins, preserving backups.
6. Moved backups outside the startup plugin directory.
7. Tested a fresh MCR_CACHE_ROOT.
The executable-stack and C++ version errors were resolved, but the FrameworkShutdownHolder assertion persists.
I understand Ubuntu 26.04 is outside the listed supported platforms for MATLAB Runtime R2021b.
Has anyone encountered this assertion with Spike or another MATLAB-compiled application? Is there a known workaround for this environment, or a newer Spike build with a runtime compatible with Ubuntu 26.04?
I can provide the complete crash report and loader diagnostics.

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