What changed in Catalina that killed unlock origin?

[mentaluproar]

My other extensions work fine. What changed in Catalina that kills support for ublock origin?

 

[haralds]

Is it notarized and "allowed" in the Security & Privacy Prefs?
3rd party extensions allowed also require a reboot before running.

 

[KALLT]

Support for “legacy” Safari extensions is not present in Safari 13.