Bug: Minimap cannot be closed when bound to Mouse Button 4 (Mouse 4)

This issue has existed since 2042. Eventually they fixed it 2042 a year or so after launch.

The only way to workaround it, is if you can bind the side mouse button to M itself instead of 'side button'. So if you press your mouse's side button, you're pressing M on the keyboard. This is a workaround.