I don't think that mesa upgrade changed anything, I still get the hang regularly. Restarting plasmashell sorts it out.
Ø dpkg -l | grep mesa
ii libegl-mesa0:amd64 23.0.2-1ubuntu1 amd64 free implementation of the EGL API -- Mesa vendor library
ii libgl1-mesa-dri:amd64 23.0.2-1ubuntu1 amd64 free implementation of the OpenGL API -- DRI modules
ii libglapi-mesa:amd64 23.0.2-1ubuntu1 amd64 free implementation of the GL API -- shared library
ii libglu1-mesa:amd64 9.0.2-1.1 amd64 Mesa OpenGL utility library (GLU)
ii libglx-mesa0:amd64 23.0.2-1ubuntu1 amd64 free implementation of the OpenGL API -- GLX vendor library
ii mesa-utils 8.5.0-1 amd64 Miscellaneous Mesa utilities -- symlinks
ii mesa-utils-bin:amd64 8.5.0-1 amd64 Miscellaneous Mesa utilities -- native applications
ii mesa-va-drivers:amd64 23.0.2-1ubuntu1 amd64 Mesa VA-API video acceleration drivers
ii mesa-vdpau-drivers:amd64 23.0.2-1ubuntu1 amd64 Mesa VDPAU video acceleration drivers
ii mesa-vulkan-drivers:amd64 23.0.2-1ubuntu1 amd64 Mesa Vulkan graphics drivers