there it is:
wishing well.json.zip (4.4 KB)
note that I'm new to this and my coding abilities are weak so.. I'm sure there's a better way to do it but this is the solution I came up with so far..
the ROOM script keeps track of the current tiles where the icon is going to be displayed
( to swap them back )
I used an ITEM to act like a trigger. so you'll find most of the code there.