Known Issues in Modern Windows Port (.NET MAUI WinUI 3) - hyvanmielenpelit/GnollHack GitHub Wiki
1. In the full screen mode, 32 pixels near the top of the game screen have a wrong cursor and does not respond to mouse clicks
This is a bug in .NET MAUI 9.0. Microsoft needs to fix it.
The same bug causes the top 32 or 64 pixels to have a wrong cursor in the game screen, when you switch the game between different displays with Win+Shift+Left/Right.