Castaway - Not able to leave arena after winning boss fight.

Hi Team,

Just did my first Castaway and after killing the boss and picking up the explosion thing i was unable to leave the arena. I tried teleporting back to my hideout and back as well as exiting to character screen as well. I could see the label Arena next to the Checkpoint but it would not let me exit. I went and ran another map and then tried to open it again but now it says failed and i can not re open. I was looking forward to blowing up whatever it was for the treasure :(

Bit of a shame to miss out on the Atlas points as well it offered as a reward.