First Herald Benedictus Bugged/Excavated area quest

-I kill boss "First Herald Benedictus" (excavation zone).
-After killing him the entire animation plays, where the traitor (kanu) gets leaped and killed.
-I collected my loot and the doors opened to the excavation zone (where the 3 murals of the weapon are).
-I decided to go and clear the rest of the mapbefore i go in the excavation tunnel.
-I come back to the entrance (murals/excavation tunnel) and as soon as i walk inside my character starts walking (assuming its part of the rp).
-while the first mural animation pops up, an npc spawns next to me. (he was chasing me after i thought i cleared the zone).
-At this point my character is in role playing mode and i cant attack, simply walk around.
-I decided to just hit esc key and spawn at nearest checkpoint.
-When i re spawned and instance reset, I get the boss dying animation again and he disappears right after.
-Excavated tunnel/door does not re open and i cant continue with the story without going in.

i am submitting a Gyzo clip. very short. You can see the boss just disappear. The tunnel/door opening sound also get triggered but doors stay closed. Clip very short so you cant hear doors sound.

**Be aware clip is loud so lower your volume**
https://gyazo.com/e3d09fde2bd1b468a595f38857fb43b6