This is likely a small, niche issue for many. Personally, I am someone who likes to make gall/parasite/etc observations. When I do these, I make an initial observation for the host, making sure to get accurate time/location/etc. Then via the desktop site, I “Duplicate” the observation. Formerly, there was a one-click option to remove all photos that were associated with the host ID to make the new observation a blank-slate. That option seems to be gone now and I have to manually uncheck each individual photo.
Again, this is a small issue, but I am curious if it is simply a bug or an intentional change.