I'd like to tell about a bug I encountered while using the mirror on Lady Vengeance.
If you're playing online, and you're not the host, then use te mirror on the Lady Vengeance, and then quit the session and rejoin again, you'll be prompted to create a new character, instead of looking at the characters you were using before.
If you then confirm the new character, it'll give you an infinite "Waiting."
If you then quit the session, the host will now see your newly created character.. At level one.

Another one I've encountered is if you overwrite a keybind onto another keybind, then hit apply, and quit the game completely, and launch it again. It will now have both keybindings on both things, meaning that now two things are bound to a single key.