Any news from Devs in regards to this issue? Happens to me quite often in Old City ruins under Neketaka, when I engage multiple enemies at once, stuck in combat even as I am writing this message, because of one lousy un-targetable gul which at first kept following my group and missing all of it's attacks, and now it's "stuck" on plain smooth ground and just keeps "grinding" there. Happened often with those small grubs in area, but I was able to move away and thus lose the aggro, happened with some rotghasts and now this...
Game's been running for a while now, also it seems to happen with enemies which spawn in large numbers and are, possibly, defeated instantly with some big attack or AoE, maybe also have some debuff of them (can't check that since I can't target the blasted thing), no AoE's or bombs or anything can kill it.