Whenever your hand is on the last slot and you go into chat, your hand moves to the previous slot.

How to reproduce: Have your hand on the last slot. Go into chat. If you were holding something (specifically, something long like a sword or a stick), you can see your hand switch. Leave the chat, and your hand will be on the second-to-last slot.

Not a major bug, but it'll people throw some people off, especially when using the /enchant command.

This has been happening on both Samsung Galaxy A20 and Samsung Galaxy J3 Prime devices.