Since I had more challenges than I asked for with 23.7, I thought I drop e message to say that Unbound now works as expected. It has been running 4 days now with no hickup. Do note that I still use my old config - I have not changed anything regarding to Unbound: Blocklists, DNSSEC, DoT, DHCP registred, and only IP4. This is the same config as I used when upgrading to 23.7. So no I did not need to reinstall and manually reconfigure all.
Now where is that egg clock?