first trial of sekhema completion issue

Just beat the first trial with a friend and upon boss kill, without moving forward, we both teleported back to the caravan to sell from our full inventories.
The portals do not allow travel back into the trial, as it is counted as completed. This effectively locked us out from both the loot of that run and the ascension at the end. We had to redo the "first" trial to progress the quest.
Since boss drops can easily overfill inventory slots, this is bound to happen to more people Allowing travel back into the instance would help.