I have a dark mode schedule, along with which I also have a Night Light schedule and a Sleep focus. Because when it is out of sleep focus, its back to the normal colors...
Then during sleep focus, if you check the lock screen, spotlight on lock screen and the -1 screen on the lock screen, you will see colors washed out..
Edit: Probably only the sleep focus Lock Screen as the colours come alive in the other focus modes despite dark mode and night light