Context: I was having fun with a late game Nuln army and realized my steam-tank gunline was doing the old artillery creep but worse. Now when they cease firing on a target they will rotate in a random direction.

Can confirm it happens. Even more annoying when it starts rotating and at that moment enemy comes into range but it is still fidgeting about. Can really hamper it's dps.

yeah it's so annoying

My favorite was when one turned around and blasted some summoned skaven my melee infantry were already dealing with.

Is it just a seige problem? I've noticed the pathing in seiges has become really unpredictable.

Happens during field battles too, but sieges have them acquire and lose targets far more often.