Originally Posted by Unregistered2

The stage select screen is the only place it shows 1 gem as the reward. It's looking like incompetence might have won out over fixing beneficial bugs. Previous instances of ghost-loot were fixed by a refresh but these gems are remaining. I'd try using them if they hadn't nerfed the gacha or I didn't have more than 50 gems before.

They were showing as x100 to me until I wiped my cache; I (obviously) can't run them again to see what they actually give now that I did that.

I'd also try using mine but I had >50 before, so I'd be throwing away known good gems to test the "unknowns".