Recently I've noticed, that Solid Explorer regularly hides files, or more precisely displays a gap where the file should be as the attached screenshot shows. The file can still be opened or highlighted (though not visibly), it's just not shown.
I've mostly noticed it on my nas, which I connected via ftp (as this gave me faster files transfers than samba). I'm not sure if other storage is affected aswell.
The files that are not displayed seem to be pretty random and I don't think it's a permission issue, as the files in my nas' download folder i.e. usually have the same permissions. Apart from that Solid Explorer CAN access them. it just does not display them. The issue is usually gone after deleting Solid Explorer's cache.