the AE vanilla have fixed alot of things, also it have the community fan fix.
Not seeing any major bugs, maybe some pathing issues, but nothing serious.
Something i've noticed is that if you pick up a quest item and it puts it into a non inventory slot (IE your extra bags) You can't turn in the quest as the game won't recognize it. So to fix that you've to put the quest item in the normal inventory space, then relogg and go talk to the npc again and it'll work.
This annoyed me quite a bit due i loot everything so my quest items have a tendancy to enter my extra bag space.
Also pathing issues i noticed sometimes with my wolfs, if it's a narrow path or corridor they often refuse to attack the enemy until i charge in and literally stand ontop of the mob.
Only a few places i've noticed this behaviour though.