Hibernate doesn't return manually INSERTed rows

I'm having an issue with my jpa repository doesn't return rows that I've manually inserted into the database (Oracle) via good old SQL

Insert into SYSTEM.USER (ID,CREDENTIALS,ISADMIN) values (USERSEQ.nextval,'foo',1);

My Jpa Repository

@RepositoryRestResource
public interface UserRepository extends JpaRepository<User, Long> {}

User entity

@Data
@Entity
public class User {
  @Id
  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "idgen")
  @SequenceGenerator(initialValue = 1, allocationSize = 1, name = "idgen", sequenceName = "userseq")
  private Long id;

  @NotNull
  private String credentials;

  private boolean isAdmin;
}

The super weird thing is that entries that I've inserted via the REST interface works!

So if I create:

• User A via REST API
• User B via SQL statement
• User C via REST API

The result of GET /api/users is A, C

After pulling out all my hair. I think I've narrowed it down to the Flashback feature Oracle has. As only A and C has entries in the Flashback. So Hibernate must do some magic behind the scene.

So my question is. How do I insert a row using SQL so it get a flashback entry also.

If the flashback thing isn't the problem. How do I make Hibernate return all the rows then?