OpenGL (and ES) accel broken on RPi4 with 21.10

Seems a lot of OpenGL applications are just utterly broken on the RPi4, when using Ubuntu MATE 21.10. Most games for example, crash with GLXBadFBConfig. (and the stack pointed to[0xffff8c5807dc]) I've tried everything to fix this, such as editing my /boot/firmware/config.txt file, updating to the latest bleeding edge Mesa builds via a PPA, nothing works.

It didn't always crash like this. With Ubuntu MATE 20.04, it was fine.

No insight from anyone?

Updated to 22.04 and still having the same issues. I think I've been patient enough, and I'm really starting to bloody well hate this device.