I have a gaming mouse with two extra buttons on the side, one of which I use in Minecraft. In the program used for configuring the mouse buttons they are labelled as "Windows Button 4" and "Windows Button 5" and they are labelled as Button4 and Button5 in Java Edition. However, in the Windows 10 Edition they are labelled incorrectly, with button 4 being labelled as Button5 and button 5 being labelled as Button6. It is not a huge deal but can be a bit confusing.