Til21 🇩🇪 I mean not only Google photos, but Google Cloud. Do you see them in Google Photos? If yes, try to clean the cache of Nothing’s gallery, maybe reinstall it. Maybe you can do screenshots with photos unavailable in Nothing Gallery and available in Google Photos and sent them to support…
I had a problem where my photos weren’t fully accessible through Nothing’s gallery but they were all shown in Google Photos. Like I had an album with 800 pictures and Nothing’s gallery showed only 200. After a few hours the problem disappeared by itself…