(Already reported to Helpshift, adding here for ease of reference)
NPCs at Bonepicker Camp (TeleportPlayer -14148 56611 -8238) sometimes spawn inside this particular tent. It doesn’t happen every time, but often enough to be noticeable. If they do spawn in this position (instead of outside just nearby) then they initially aggro as normal, but can’t move, and then they lose aggro and just stand there - they cannot be hit or moved. Not a big deal, but technically a bug so better to report 
