Pcsx2 issue running Fullscreen on gamemode

I saw some posts but none of them had actual solutions so I will try again because I got to the specific problem that is game mode.

The issue specifically is when running on game mode, standalone or through emulation. The game Black, for instance, it runs at about 80% in the beginning in Fullscreen. If you double click, the toolbar from pcsx2 shows up, then it goes full speed like it should.

If you run through desktop, it runs full speed in Fullscreen too, so the issue is specifically only in game mode.

Tried disabling vsync, fps limiter, nothing worked. Is there any settings of pcsx2 through emudeck that fixes this behaviour in game mode?

Maybe almost no one is seeing this issue because it only happens in demanding games.