Windows Nextcloud client 2.6.5 does not show all files shared with user

The same user logged in MacOS client or in the web interface can see the “missing” subfolders.
There seem to be nothing special about the subfolders which are missing from the list on windows client. Name is similar to other folders.
They are not bigger than other folders.
The one particular folder shows 9 subfolders in windows client, where there are 10 subfolders there altogether.

Please advise how to debug this situation.

Best regards,

To clarify - this problem occurs in the phase when the user chooses which folders to synchronize, (option for bigger folders) .
server version
Thank you in advance,

The folders that Windows client is not even listing, had a trailing space in the name of the folder.