IPad Pro 11 G4
Couple of things
Safari - I have my Display set to Dark full time. Suddenly all the tabs were opening Light. Killed Safari and tried again. No joy, all Light. Guess it is reboot time. Hit the volume and power button and got a “You want to Restart” message in the lower right hand side of the screen in Landscape. Never saw that before. Tried a screen shot and it rebooted, aka restarted.
That didn’t work for fixing the Light issue. Din’t save the screen shot either. Tried Display > Light/Dark and no help. Tried the reboot again and got the normal screen. Did a hard reboot and that was no help.
Had to do couple of things and when I reopened the iPad and reopened Safari, all was now well.
No clue what the heck happened nor what triggered the fix unless it was something Apple side.
Just an FYI. Happens again I’ll file a report.