This is in OpenMandriva Lx 3.0. Since updating to KFrameworks 5.36.0 we're getting everywhere in KNewstuff this "Configuration file not found: wallpaper.knsrc" or "Configuration file not found: whatever.knsrc". Is this happening anywhere else? Is there a workaround?

Would it be possible that someone here could point me toward a fix so I can inform OpenMandriva developers?

There is an OpenMandriva bug report on this:

https://issues.openmandriva.org/show_bug.cgi?id=2205