"resolution_fit": "1" doesn't work.

[Divzed]

"theme_800x600" "theme_1024x768" "theme_1920x1080" - They have 3 different background images with different resolutions, but for some reason background image and theme is drawn randomly by "default_file": "0" regardless of selected resolution and "resolution_fit": "1" is ignored every time when I boot Ventoy, why?
I tried it on live system UEFI/BIOS and VirtualBox VM UEFI/BIOS, monitor resolution 1920x1080. I also tried to remove "default_file": "0", but issue still persists.

My ventoy.json:

Code:

{
    "theme": {
        "file": [
             "/ventoy/themes/theme_800x600/theme_800x600.txt",
             "/ventoy/themes/theme_1024x768/theme_1024x768.txt",
             "/ventoy/themes/theme_1920x1080/theme_1920x1080.txt"
        ],
        "default_file": "0",
        "resolution_fit": "1",
        "gfxmode": "1920x1080",
        "display_mode": "GUI",
        "serial_param": "--unit=0 --speed=9600",
        "ventoy_left": "95%",
        "ventoy_top": "1%",
        "ventoy_color": "#000000",
        "fonts": [
            "/ventoy/themes/theme_1920x1080/terminus-12.pf2",
            "/ventoy/themes/theme_1920x1080/terminus-14.pf2",
            "/ventoy/themes/theme_1920x1080/terminus-16.pf2",
            "/ventoy/themes/theme_1920x1080/DejaVuSans-48.pf2",
            "/ventoy/themes/theme_1920x1080/DejaVuSans-Regular-14.pf2"
        ]
    },
    "menu_class": [
        {
            "key": "Windows",
            "class": "Windows"
        },
        {
            "key": "windows",
            "class": "Windows"
        },
        {
            "key": "Win",
            "class": "Windows"
        },
        {
            "key": "win",
            "class": "Windows"
        },
        {
            "key": "memtest",
            "class": "MemTest86"
        },
        {
            "key": "iso",
            "class": "ISO"
        }
    ]
}