This is a really annoying "feature", you spend alot of time trying to kill a bear and then it goes into the "berserk" mode and fucking runs away, never to be seen again.
Foxes running away are really annoying aswell because it's pretty much impossible to catch them. I thought I heard someone say it was fixed before but it turns out it wasn't.
Oh yeah when the animal has lost aggro you don't get as much lp once you manage to catch up to it and kill it which is annoying aswell.