I have downloaded 4.44 and I have gone into a BF in act2 for the first time.
It has mutants and mages and citadel archers, none of which are giving XP when I kill them. The same thing happened in the pit where the Shaman trapped me.
No XP for killing anything.
I am at level 20. If there are no XP's in act 2 BF's I will move on to act 3.
All other quests in act 2 are completed except for the BF's I have not entered yet.