first one i did had worms that would move underground and i unwittingly cast an ability on one but it was somehow “immune” despite being partially damaged already. From that moment in I had the stuck in combat bug. This persisted after leaving the zone and returning. Very first mob i engaged retriggered stuck in combat. This happened for all 3 arathi quests. Earlier in the day i did wq’s and the like with no issues
edit - i just went back and tested on a random non quest mob in the zone, immediately stuck in combat. Whatever happened at the first arathi quest site has caused a seemingly permanent fault on my character
another edit - attacked a bird in dornogal, not stuck in combat
fun times. I wish it happened on my mage as i could easily bail out via teleport, alas it happened on my warrior alt which was painfully frustrating. Cant believe that it violated even rogues vanish. Sure seems like it somehow impacts on the actual character, What else could be happening on the code side that we arent aware of? perhaps its killing item durability as well causing gp loss (not that gp is exactly huge but its still time lost in the grand scheme of things)
There’s one mob in particular in Untamed Valley (southeast questing zone) that is permanently immune and will keep you in combat until you force close your game.