Either javax.persistence.schema-generation.database.action or hibernate.hbm2ddl.auto can be used to control schema creation when using Hibernate, with the latter property taking precedence over the former.
When HibernateDefaultDdlAutoProvider determines that the default should be create-drop, hibernate.hbm2ddl.auto is set with that value. Due to the Hibernate property taking precedence, if the user has set javax.persistence.schema-generation.database.action it is now ignored.
When checking for a user-provided setting before configuring the default setting, I think we need to consider javax.persistence.schema-generation.database.action as well as hibernate.hbm2ddl.auto.
Comment From: snicoll
Closing in favor of PR #25129