I’ve tried several work arounds to get access to the selection screen after accidentally pressing K instead of L while trying to choose loot.
Can confirm this bug... it's super annoying. There's a way to fix it though. You must change the current map (teleport somewhere else), which should fix it. Worked for me so far.
That helps for the last boss but I hope they change it because the mini boss fights are still the problem. Thanks for the info.