Description of Bug: Dropping a pot on a tile that contains a campfire makes two ashes spawn on the ground immediately, without changing pot contents or apparent fire level. This seems to work once per fire, so I wondered if it was intentional.

I tried this with three campfires. The first time, I used the drop action, which just puts them on the same tile without setting them on the campfire; on subsequent attempts, I dragged the pots, which set them on the fires properly. Both produced ashes. I only tested the combinations of [pot of cold water + dropping] and [empty pot + dragging] because I wasn't astute enough to fill the pot and drag it.

At least enough fire remains afterward to boil another pot of water.
Reproduction Steps:

1.  Have a cooking fire (unclear whether this step is mandatory; ashes will not appear on a cooking fire, though)
2.  Have it burn down to a campfire
3.  Drop a pot onto it..
4. Ashes will appear on the ground in the same tile
5. Trying it again with the same campfire doesn't do anything.

Error message (if applicable):
Screenshots: