"order_inserts = true" causes FK Violation when inserting Self Referential Entity with Single_Table Inherited Entities

In a particular case as described below, order-inserts = true causes FK Violation, while order-inserts = false does not:

1. A (a self-referential Entity) is inherited by both B and C using Single_Table inheritance strategy.

2. We have created entites as so: C1 -> B1 -> C2 -> A1, where C1, C2, B1 and A1 are entities of types C,C,B and A respectively.

3. When persisting C1, an FK Violation is thrown.

4. In attached testcases

1. , it is also observed that the order of inserts of some entities referred to by A,B or C gets ruined and causes FK violations different from observed with above case.

Above cases work just fine for order-inserts = false.
Both above cases are included in the attached test cases. Is this a limitation of the order_inserts feature, a bug or am I missing an accepted workaround?

Edit: Was reported in 5.2.8.final, tested in 5.2.17, 5.3.1 and 5.3.7 and same test cases failed in all versions.
Failing test cases are:
Tests in error:
InsertSortingTest1(org.hibernate.bugs.JPAUnitTestCase): Error while committing the transaction
InsertSortingTest3(org.hibernate.bugs.JPAUnitTestCase): Error while committing the transaction
InsertSortingTest6(org.hibernate.bugs.JPAUnitTestCase): Error while committing the transaction
InsertSortingTest9(org.hibernate.bugs.JPAUnitTestCase): Error while committing the transaction