Mila/Lukka attack prompt
Creating an attacking token (at least with Adeline, Resplendent Cathar) while my opponent controlled Mila, Crafty Companion caused a prompt for me to "select which player or planeswalker" my token was attacking. At the time, my opponent controlled no planeswalkers, so I assume the game recognised Mila's back side Lukka was a planeswalker despite the fact the permanent was not a planeswalker in that moment.
The bug occurred each of the three times I attacked with Adeline in play, and at no time did my opponent control a planeswalker.
The bug had no adverse effects, other than being a nuisance, as I was able to select my opponent and attack them as normal with the token.
I play on PC and have not attempted to reproduce the bug, as I assume it would be easy to do if someone who wanted to.