Linux SDL3 fullscreen fails

[Supded]

And switches to borderless with bugged cursor position and unused black area. It works normally after switching to fullscreen, but every launch ruining this setting.

[Supded]

1680x1050
But config was overwritten by the game
//=======================================================================
// Generated by Xash3D FWGS (4133, b449523, master, linux-amd64)
// video.cfg - archive of renderer variables
//=======================================================================
_window_xpos "0"
_window_ypos "0"
fullscreen "2"
height "970"
r_refdll "gl"
vid_maximized "0"
vid_mode "0"
vid_rotate "0"
vid_scale "1.0"
width "1680"
// end of video.cfg