Hi,
first of all I want to thank everybody working on or donating for this major update of GeoServer 
I now upgraded my server used for seeding tiles to the release candidate and filling the caches works as expected. The environment is Windows Server, Tomcat 11, Java 21 with Oracle and WMS data sources. The only problem is that the oracle.net.tns_names system property is ignored, which I already reported in GeoServer 3 Oracle OCI TNS problem.
My other servers I will be testing when the GeoFence extension becomes available.
I’m just trying to get used to the new UI, so I can’t give much feedback in this regard.
Regards
Daniel