Fighting my first undead priest in a while. Miasma interrupts units moving in, causing them to take damage. See Sir Siegfried there – black helmet, heater shield, mace. He started below my shield/sword & dagger shield bro. He moved into the space directly above my dagger bro, then stopped and took damage, as you can see in the log. I was then able to resume his movement. I don’t think that happened before, but it might be intentional.
The bigger issue, though, is that Albrecht there can’t move anywhere. Not behind him, not through my guys, nothing. Confirming the move interrupts the up & down “active unit” animation and cancels the move. Same thing happened with Reiner (throwing axe bro), but I ended his turn on reflex before I realized what happened. Attached dxdiag, log, and a screenshot.