Using an @Embeddable with a @generated field causes the following error :

org.hibernate.tuple.entity.CompositeValueGenerationException: Property of on-execution generated embeddable is not generated: child.prop1

Using the following code :

@Entity
public class Parent {

    @Id
    private String id;
    @Embedded
    private Child child;
}

@Embeddable
public class Child {
    private String prop1;
    @Generated(event = {EventType.INSERT, EventType.UPDATE})
    private String prop2;
}

Hibernate seems to be expecting all attributes (or none) to be @generated.

This used to work on previous versions (tested OK on 6.1.7).