As you can see in the above pictures I am using the Fedora theme and you can see the dynamic wallpapers configuration. Also night light is enabled (I do not think it is related to that but might useful).
All other programs are displayed in light mode (bright appearance).
However my wallpaper is in night mode. I have the same problem with other day/night wallpapers too.
It happened after I updated to Plasma 6.5.1 from 6.4
Did you configure automatic switch from light to dark?
This is new in 6.5.
No, as you can see in this picture auto switch is disabled.
I upgraded my system to Fedora 43 on the day its stable version was released. Two days later the Plasma 6.5 was placed in the stable repository. I installed the update and restarted my computer.
After reboot I saw that the wallpaper is in night mode.
Does anyone else have the same problem?
If you do not get an answer here try asking the KDE folks over on https://discuss.kde.org/
