SMB External Share Datasync multiple Users

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Nextcloud version (eg, 12.0.2): 15.0.7 (got known from 15.0.4)
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.29
PHP version (eg, 7.1): 7.2.15

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): N

Hello together.
Given is an nextcloud updatet to 15.0.7 on an Ubuntu 18.04 up to date and smbclient VErsion of 4.9.5 because auf troble of Notification SMB in the 4.7.X version that comes with Ubuntu but the following problem is regardless of that.

Userbackend is LDAP (AD) on an Server 2016.
It is used the external_store SMB/CIFS with logindata saved in Database.
In the Store is Accessenumeration active, the share has a lot of sub folders.

All Users uses the Nextcloud Desktop cleint.
User A changes an File on the Share on first Level the on the Desktop the File Changes will be submitted to User B as well.
User A changes an File though web-browser (even txt) the changes only submited to user A, user B has to open the file in the browser or to visit the folder of the file in the browser, than it will be synced to the cmputer.

User A changes an file or create an file in an subfolder, no changes will be noticed for user B.
If user B browses to the file, than it will be synced.

The expected behavior is, that user A changes an file or creates something on the share (per client or browser), user B will sync the data to his desktop as well.
A view minutes after i was upgrading from 15.0.4 to 15.0.7 it worked like this but than all of a sudden it stopped working.
There no errors in the Logfiles of the nextcloud so far.

If the share set up with username and password saved in the nextcloud, than it works. But than the accessenumeration on the fileserver could not be used.
Because the fact, that changes on the first level got noticed, as log as it was initiated per client are synced, shows that it sould work also for subfolder as well.
The nextcloud should know what file was changed and provide the clients the information so the clients can check the backend store.

Is there a workaround to force the clients to checkup the store for changes?

Thank you for help.

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