…or at least figure out why they're failing. It doesn't seem to be bad action caches, I was able to reproduce this in a "clean" environment.

It looks like it fixed itself, see https://github.com/BluSunrize/ImmersiveEngineering/runs/1686848403. I don't know why it broke, or why it fixed itself; I guess it was just some server having issues and FG not reporting the problem properly.