Accessing animation in a prefab (edit or no edit) will cause unity to crash when closing

Just started happening to me today, although almost all my unity crashes are animation/animator related. I made a change to an animation in a UI prefab, saved, then closed the prefab, and it crashed. Since then, any time I touch any sort of animation in this prefab, even if I don't change anything, unity will crash the second I close the prefab.

thankfully i can save beforehand, but its very frustrating having to wait 1-2 minutes because i have to relaunch unity between changes.

I've attached a log below.

I tried reporting this using the crash report, but in 2021.3.5f1, the bug reporter doesn't work! very neat