What went wrong?
During the fight with the big fire miniboss in Ancient Forest, potions dropped in the inaccessible lava and couldn’t be picked up. I wasn’t able to move him during the fight either, so he stayed wedged up against that lava. The potions appear to drop in a radius around him, and because of where he’s positioned, two of them couldn’t be picked up.
Screenshot:
https://i.imgur.com/W9lALZL.jpg