Missing "Move to Personal Library" from menu

My wife and I have a shared photo library, and each our personal library. For some reason the option to Move selected photos from the shared to personal library on her phone no longer appears in the menu after selecting some photos. She had thousands,and I was able to move 99 at a time before, after which the button disappeared that was to the right of the trashcan, presumably because the font was too big in portrait orientation on the iPhone 13 (IOS 17 now). When I turned the telephone in landcape, the button reappeared and then I could move more than 99 at a time. I did this a few times, and now when I try to move more/the rest of them to personal lib so she can batch-download them (Can't select more than 1 from shared lib and download en masse with the icloud.com website), I dont have an element in the list of choices to move to Personal anymore. Why why why?