Someone had tested on 20.04 before and it did reset too.
Similar issue.
https://askubuntu.com/questions/1233030/nvidia-settings-reset-randomly
https://askubuntu.com/questions/1241645/nvidia-settings-reset-when-playing-video
There is possible gsd.power.manager check for blacklight but it was set
by nvidia thus it get reset when value null.
/* Fetch the current target brightness (not the actual display brightness)
* and return if it is already lower than the idle percentage. */
gsd_backlight_get_brightness (manager->backlight, &brightness);
if (brightness < idle_percentage)
https://gitlab.gnome.org/starnight/gnome-settings-
daemon/blob/c64c243e345cb92ed0c197a377767bcbf1704c1b/plugins/power/gsd-
power-manager.c
Or there is possible conflict on gsd.power on wayland with x11.
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https://bugs.launchpad.net/bugs/1892094
Title:
Xrandr brightness and gamma settings not remembered on power resume
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