I had an issue that my Heating Group was flagged as offline after upgrade to 2.5.0
I have deleted the Thing and redicovered. When adding the Thing I get an error 409 in Paper UI and the following Log error.
2019-12-27 10:36:26.753 [ERROR] [home.core.thing.binding.ThingFactory] - Thing factory (class org.openhab.binding.homematic.internal.handler.HomematicThingHandlerFactory) returned null on create thing when it reports to support the thing type (homematic:HmIP-HEATING).
2019-12-27 10:36:26.762 [WARN ] [g.discovery.internal.PersistentInbox] - Cannot create thing. No binding found that supports creating a thing of type homematic:HmIP-HEATING.
Might this be a regression? In 2.4 it worked for me already.
The Binding is installed and active. Which makes sense, since my other H Devices work.
But I have confirmed via console that the binding is active.
After deleting the HM IP Group from the paperui inbox and clearing the cache, the situation is worse, because the group is not even discovered in the inbox anymore.
Even a restart of the CCU2 does not solve the problem.
I would do a few restarts of OH, watch the log in frontail, and wait untill OH is completely up and running between restarts. Post the logs and maybe there is a clue. You can also set the log to DEBUG for more info/clues.