This happened last update too, so frustrating.
Since I updated yesterday I have lost the scroll arrows on the photo's app screen, and I can't scroll with my keyboard arrows, between photo's.
However this time I can't seem to resolve it, and I've done the advice in previous posts including:
You may want to try a reset: Start Menu/Settings/System/Apps & features/Photos/Advanced Options/Reset
A temporary work around is going "ctrl A" on all the photo's in the folder, this seems to bring back arrow functionality, but I don't want to have to do that every I wish to scroll through photos - I just want it to work like it is supposed to, and I'd love to have confidence that every time I had to do a microsoft update I'm not going to lose scrolling, or a printer driver, etc.
Seriously Microsoft can you not get this working, its been an issue since 2016!!!