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Personally I think this is to do with how the windows sends commands to update notifications. I had a similar issue with Directory Opus 12 not finding my portable usb drive until I refreshed Directory Opus.
If you come out of the folder and back in if it doesn't show anything in Directory Opus then surely it is not checking the folder each time you go into it. Thats if that happens to you. If this happens in explorer to then notifications are blocked or not updatinp until a refresh.
One solution that might help disable antivirus / firewall and test issue if it works its these that are causing the problem.
My issue on windows 10 went away maybe by an update to windows or an update to something else.