So, the laptop is dell g16 (7620), 16gb ram, ssd.
I tried the 1 minute screen timeout, to no avail.
Screensaver is set to ribbons. I noticed it sometimes works, random.
Spotlight does not work.
Also, i dont know if this is relevant, the option "show the lock screen background picture on the sign-in screen" in lock screen settings is set to "on".
Something i thought, i have a razer mouse which goes with the razer central software. In that, there is "axon" software which changes the background. Just mentioning this, maybe it affects the system. However i have disabled it and still same, no screensaver!