yeah 2.92 seems to be very buggy,
You could try importing the armature data, and then applying it to a new armature.
This *might* circumvent any weird 2.92 issue, however, because the data was created in that version, I might be wasting your time.
Another way to speed up the recreation is to snap the bones of a brand new armature to the locations of its evil broken counterpart. (I hope that makes sense)
