No, but funnily enough they reappeared a few hours ago even though I didn't do anything to cause that :) I think I'm gonna manually upload them to my Google drive now just in case they disappear again
There's no updates available for the gallery, and the problem is the pictures disappeared from Google photos at the same time they did from the gallery
I believe the option to automatically clean up clutter is disabled on my phone's cleaner, but I think I've clicked on 'clean up junk files' before, not knowing what it'd do exactly. This has never lead to any photos disappearing before, though.