I ran into another one recently. Not really a bug, but a quirk that seriously screwed with what I was doing.
I had recorded a new multi-tracked take and I wanted to slip edit some of the files jointly (can't remember why). I used ctrl+clicking to select the ones I needed to edit, and accidentally held control while slip editing, this obviously time stretched the clips instead. No problem, I thought, and still holding control I pressed Z, but instead of undoing the time stretching, my recorded clips disappeard (as if I undid recording, the next to last action). But redo didn't do anything because the undo history said it wanted to redo the time stretching! (on clips that were no longer there).
I'm sure the actual audio files were still on disk somewhere but doing another take was in the end quicker than me trying to locate them but it's definitely annoying behavior.