Vaal Ruins Softlock -- Royal Armoury Tier 3

Ran into a softlock after clearing and looting this room, where the door to continue was closed, and returning the way I came had an invisible wall in the doorway.

1: I set a medallion for the armoury on the map near other tiles to improve it
2: I used another medallion to raise it up to tier III
3: I realized I hadn't actually closed the temple from last time, so I did that, which removed a couple rooms, notably one in the space southwest of the aarmoury
4: I continued placing rooms and connected to the sub-boss for the first time on this character/account (not sure if relevant)
5: I then started and began running the temple, clearing a couple rooms before reaching the armoury
6: I entered and cleared the armoury, and looted the items
7: At this point I realized I was softlocked, when the door ahead was closed, and returning from the southern entrance had an invisible wall blocking my progress.
8: Using the option to return to checkpoint didn't work, and there was no other choice but to portal out

Another person connected after I realized the situation and they were similarly stuck in the room. So it was replicated across the network.

Its because not all the enemies are dead. Just gotta leave the area and come back in and as long as you dont enter that room before killing the last of the mobs, you'll be fine.