Dynamic group event – Slay the centaur war beast is not working.
No assault on The Ascalon Settlement is happening. The beast itself is sleeping in the cage.
Besides, You can have a hard time completing Support the troops stationed at Ascalon Settlement quest because NPC’s are acting as if assault is about to begin (which is not happening)
P.S. I wrote those two things because they are related to the same bug.
Thanks.