I try:
1. I select and press cmd+c to copy the red part in the tile:
2. then I past and move the copy to a new place by pressing cmd + v:
3. now without unselecting I press cmd + v again. now first only the selection is gone. but when I click on the sand tile with the red dot again this happens:
This also happens when I press cmd +v for a third time and it is not important where I click. The black tile also has an index number but a completely different one.
I hope this helps to find the bug. :)
PS: A video time laps of me using Pyxel will be released soon. ;)
cheers