5.0 group policy registry settings not applied

I have set up Group Policy Objects on the Windows server, both for domain users and for domain computers.
Both policy settings are present in the client computer.

When starting LibreOffice (currently these settings are not applied.
Temporarily removing registrymodifications.xcu from %USER%/AppData/Roaming/LibreOffice/4/user makes no difference.

Is there any setting to be done on the client to get the policy settings the be applied?