I would have bet that I have auto advance in contact sheet view
If auto advance to next photo alternatives are ticked in Preferences->Preview AND the Contact sheet is open on one monitor AND the Preview is open on a second monitor AND focus is set to the second monitor (click once on the previewed image) THEN I get auto advance when using a keyboard shortcut to change Tag, Color Class or Rating.
The preview advances, and so does the highlight marking the thumbnail in the Contact sheet, but this may not be what you refer to.
I use Windows (10).