Trial of Sekhemas portal bug

I completed the 1st trial on my second character. Boss dropped some loot, but my inventory was full. I teleported back to town to drop it off. The portal back was still there but there was no name to click and it wouldn't let me teleport back. When I teleported back to the entrance the only option was to redo the trial.

If this is intended there should be a warning that you are leaving the trial, and it won't let you return.

I had this same problem. I placed my portal in the loot room. I used a second coin and got terrible rolls on the rooms and ended up dying. No ascendancy. No good drops from the chests. Still have to do the quests. Please at least consider LordMidnightX's suggestion and add some text somewhere.
Additionally, I think you might make it more clear that you can reacquire more coins from Balbala.