For problems with milestone builds, you should check the Milestone discussion thread and post if you don’t find any mention of your issue. It ensures that the developers become aware of the problem, and avoids the forum filling up with snapshot/milestone issues that confuse other users who lack context.
For those who have the same issue. It wasn’t a problem with OH4. I changed the rrd4j persistence to persist all 5sec (because of an averageSince issue).
That doing results in this behaviour that the push handling didn’t work anymore.