well maybe this has already been posted, and maybe I asked for it and deserved to lose my slice of cake but hopefully this will help identify one location in the system where items can get lost...
to reproduce:
have inventory full
eat cake and dont talk to genie as to free up a spot in inventory
get a quest reward item (therefore filling up inventory again)
run away from genie
I had hoped the slice would go into overflow kinda like a collectable does if your inventory is full... however the result is that you lose your cake