Hi,
fixed it on my own meanwhile.
I figured out, notifier and listener were not in sync. This article helped at bit.
I could not stop the listener. strace displayed some sort of waiting MUTEX so I assumed a deadlock. systemctl did not stop the process so I killed it hard (-9) and restarted it. Soon after both were in sync and I have my new DNS entry now.
Still having ome issues with DNS updates but so far it’s working.
/KNEBB