Group Folders / Nested Groups -> subfolder Permission problems

Hi all, we are currently building a structure in Nextcloud to resemble sort of a “file server” structure that is used to our Users.
The way we are trying to achieve this is via the Groupfolders App. For example:
Portal - read only for a group that contains all Active Directory sub-groups
Portal/Group1 - read only for a group that contains all Active Directory sub-groups for Group 1
Portal/Group1/Documents - rw for a Group that contains Users in Active Directory
- r for a Group that contains Users in Active Directory
Portal/Group1/Protocolls - rw for a Group that contains Users in Active Directory
- r for a Group that contains Users in Active Directory
and so on…

That seemed to work really well and the users could see all the folders they were supposed to. However when creating files and folders the problems started.
It is possible for a user in the Documents section to create files and folders however it is not possible to do so in a subfolder of “Documents” through the NextCloud Windows Client.
Creating a folder works in the web gui but is then never synched to the local client.

Any ideas on this?
This might be a big ask but can anyone try to confirm this?

Windows Client v. 2.5.3daily-Win64 (build 20190725)
Nextcloud Server 16.0.3
PHP rh-php72
MariaDB 10.3.17

edit ------------------

it seems that the issue might be caused by nested groups coming from our Active Directory. We have a group that allows read access for all sub groups. Those departmental-sub-groups then have read access to a folder specified with the department name. Within we find different subfolders that sub-sub-groups then have read or write access. I believe that the inheritance of permissions through those groups somehow breaks the synching process. Through the web-Gui and via WebDAV everything works fine.