I’ve had that happen as well and, as far as I can tell, the icon disappeared because I accidentally dragged it out of the hotbar while trying to quickly click it and then the target spot.
I *think* you can prevent the issue by locking the hotbar. The “hotbar lock” button is the tiniest little padlock icon just to the left of the hotbar.
Edit: just took a look at the screenshot posted by the OP and I can’t see the padlock icon anywhere. I still think accidentally dragging the icon away for the hotbar is the issue, though.
Last edited by Flooter; 13/05/22 10:20 PM.