The very test at https://github.com/heruan/testcase-entitygraph (also if updated ORM to 5.2.12) fails with:
Failed tests: entityGraphMultipleBagsTest(org.hibernate.bugs.JPAUnitTestCase): cannot simultaneously fetch multiple bags: [org.hibernate.bugs.entity.Order.products, org.hibernate.bugs.entity.Order.tags]
Did you try my test case? Is it wrong?