Trap in boss room

The picture above is Olroth, the boss of the expedition mechanism. It might triggering by boss die too fast.
Cannot leave the room after completing the boss fight. You must party with others to leave. This problem has already occurred in the previous patch.

https://imgur.com/koWqSJR
https://imgur.com/KuIWYCC
https://imgur.com/XH4F5FD

link Expired. Also forgot to mention that the portal cannot be used