In Track1 ServiceBus, there's a read-only property settled on Message which indicates whether the message is completed/abandoned/deferred/dead_lettered. After a message is settled, the corresponding internal variable would be set to True.

In Track2 Preview 5, we decided to remove the property from public interface to align with Java/.Net sdk avoiding long discussion on a single property.

This is taken as a post-GA feature which we could add back easily but it needs all four languages come to a conclusion that whether we should have it exposed.