Loved the game, completed (current stories) a while back but I've had issues with holiday versions of scenes that haven't saved across my newer saves. I've redownloaded the game a few times to download the new content but still can't seem to get the scenes to appear in sombra's store.
Hm, it's strange. They are unlocked by completing girl's storyline. Unless you didn't finish their routes, I'm not exactly sure what might have caused this issue. You can also double-check your gallery, since they might have appeared there instead.
If possible, could you submit your save file, so we can properly investigate the problem?
Apologies for late reply
https://drive.google.com/drive/folders/1mbB2QBlSrzGaZ2Q3TC4owV6987iqkg3a?usp=sha...
Hope you can figure out the problem.