MariaDB, mutation delete query does not delete an entity with joined inheritance

[dreab8]

Given:

@Entity
@DiscriminatorValue("S")
public static class SpellBook extends Book {

private boolean forbidden;
}

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public static class Book {

	@Id 
        private Integer id;
	private String title;
}

the following test fails

@Test
public void testHqlDelete(VertxTestContext context) {
	final Integer id = 1;
	final String title = "Spell Book: A Comprehensive Guide to Magic Spells and Incantations";
	test( context, getMutinySessionFactory().withTransaction( session -> session
					.createMutationQuery( "insert into SpellBook (id, title, forbidden) values (:id, :title, :forbidden)" )
					.setParameter( "id", id )
					.setParameter( "title", title )
					.setParameter( "forbidden", true )
					.executeUpdate() )
			.call( () -> getMutinySessionFactory().withTransaction( session -> session
					.createMutationQuery(
							"delete from SpellBook where id = :id and forbidden = :forbidden and title = :title" )
					.setParameter( "id", id )
					.setParameter( "title", title )
					.setParameter( "forbidden", true )
					.executeUpdate() )
			)
			.call( () -> getMutinySessionFactory().withTransaction( session -> session
					.createSelectionQuery( "from SpellBook g where g.id = :id ", SpellBook.class )
					.setParameter( "id", id )
					.getSingleResultOrNull()
					.invoke( Assertions::assertNull ) )
			)
	);
}

Because the SpellBook is not deleted.