It looks like this issue is still occurring but also on other platforms. I have altogether about 140 entries - all of them put into different folders. 116 are appearing in “no folders”. Search function often shows two results - very irritating.
I use following versions on following platforms:
linux 2023.2.0
ff-extension (for linux) 2023.2.1
android 2023.2.0 (5944)
windows 2023.2.0
For me it fit’s very well to this post
No Folder shows all entries