When I shift click on a floatron (to replace blocks) It deletes the floatron instead of putting it back in my inventory. I've done this by accident a few times and it's very disheartening especially early in the game. This bug was on v1.12 so I don't know if it persists in your latest update. Thought I should let you know. I think it's a 100% reproduce rate but I can't promise that.