While doing a Tier 8 Underkeep today with my husband, we noticed only 2 Underpin allies when they’re should have been 3. We checked and double-checked, and then I started to do /tar Underpin to see if I could find them. I found a goblin unkilled, and marked it with an X. In going through the dungeon to find it, we found in below us, through the floor. In looking further around, her gold pile was on top of a spike/spire. She obviously had spawned on top of the spike and feel through the floor.
I’d post the screenshots I took but links aren’t allowed.