Bug: Can't complete first Trial of the Sekhemas

Finished all the trials, Town Portalled out before opening any chests because inventory was full (my mistake, I'm sure), then couldn't come back through the portal to complete the quest/ascension.

Tried going back to the beginning, and Balbala gave me the coin back, but now I'm stuck unable to restart or complete the trial; opening the Relic Altar and clicking to place the coin does nothing.