Problem with PCSX2 (Flatpak)

I use Linux (Ubuntu 22.04), here all my other 26 systems worked correctly whether with appimage, flatpak or folder in /home/user/Applications (Vita3K for example).

But when I select the "PCSX2 Legacy (Standalone)" option to use the PCSX2 flatpak I get the error "unknown parameter: '--nogui'", I managed to work around this problem by creating a "es_systems.xml" file inside "custom_systems" by changing the line:

%EMULATOR_PCSX2-LEGACY% --nogui %ROM%

for

%EMULATOR_PCSX2-LEGACY% %ROM%

I am reporting this because not everyone may be able to get around this problem.

Apart from this problem with the pcsx2 flatpak the only thing that I haven't been able to make "perfect" yet is how to close the emulators without using a keyboard, I still haven't found a way to close some emulators using the joystick.