Does HHH-11019 Open change the default flush mode?

Again, the entire point of this discussion is regarding extended persistence contexts, so I'm not sure why you are even mentioning other types of persistence contexts.

Because, the scope of app managed persistence contexts are also longer than the JTA transaction lifetime, very similar to extended persistence contexts.

If you choose in Jipijapa that PersistenceContextType.EXTENDED should not imply a manual flush mode... well I guess that's your prerogative. I think that is completely wrong, but its your call what you want to do in WF.

I'm not sure that I have any control over what the Hibernate Session flush mode is, especially for app managed.