Rustbowl map stuck in the "arena"

Hi,

I killed the rusty king boss in the Rustbowl arena and teleported to my hideout. Went back into the map to finish it and I was unable to exit the pit. 2 portals with "arena" written on them spawned. I am unable to go continue with the map.

Screenshot here:

https://imgur.com/a/LQBpfVq

Video :
https://youtu.be/-Z3UjuXS9FU?t=12