I think this is a different bug. The enemies didn’t overlap until I had killed 4/9, and then a double hit by Ayneris left two overlapping tiles that were _duplicates_ (not like, bandit 1 overlapping bandit 2, but bandit 5 overlapping bandit 5). And each copy had its own turn and its own health.
As for the other bug, I’ll try that and pay closer attention, although I’m struggling to recall a battle where the sinultaneous action didn’t happen. Will try it tho