On CentOS 10, the dark style uses the default Adwaita dark background

[michel-slm]

The override in /usr/share/glib-2.0/schemas/10_org.gnome.desktop.background.default.gschema.override only overrides picture-uri and not picture-uri-dark, so it defaults to the Adwaita dark background instead - and that file is not preinstalled so no background is shown.

$ gsettings get org.gnome.desktop.background.picture-uri-dark
'file:///usr/share/backgrounds/gnome/adwaita-d.jxl'

[areguera]

What background do you have selected in gnome-settings when executed the gsetting command? It looks like only if we have selected either the background "based on time of the day (the one with the clock indicator)," or the one "based on style mode," the background changes accordingly.

Here is my test.

With the background based on time of the day selected:

$ gsettings get org.gnome.desktop.background picture-uri
'file:///usr/share/backgrounds/centos.xml'

$ gsettings get org.gnome.desktop.background picture-uri-dark
'file:///usr/share/backgrounds/centos.xml' 

With the background based on style mode selected:

$ gsettings get org.gnome.desktop.background picture-uri
'file:///usr/share/backgrounds/centos-day.png'

$ gsettings get org.gnome.desktop.background picture-uri-dark
'file:///usr/share/backgrounds/centos-night.png'

Note that these commands are not using a dot between background and picture.

$ gsettings --version
2.80.4