Dire Maul Warpwood Quarter has a pathing issue where No Path Available prompts trigger when attempting to Charge using a warrior (among other abilities). All NPC pathing is broken and final boss in inaccessible when clearing from the beginning.
Patch 9.0.5 Retail.
Still bugged as of today, is this just going to be left broken forever?
Can’t get the imp to move, or sometimes he moves and then teleports back.
No Rum Tum Tuber for me 
had this happen with my group, whole dungeon broken, and npc could not attack as the evade and could run pass, and loose agro. had to stand close to boss to be able to attack it. also at the end when talk to the tree to open the door. nothing happens.