First commit (b3aaa12b64ccb68b3b3f4c55d1ce2a894165670b) updates test code (only), which exposes HHH-10977 Open and HHH-10973 Open in the existing test suite.

The following test reproduces HHH-10977:
org.hibernate.test.bytecode.enhancement.mapped.MappedSuperclassTestTask

The following tests reproduce HHH-10973:
org.hibernate.test.bytecode.enhancement.association.OneToManyAssociationTestTask
org.hibernate.test.bytecode.enhancement.lazy.LazyLoadingTestTask

The second commit fixes HHH-10977 Open (only).