quarkus: Hibernate fails on complex orphanDelete=true cases and bump version upon merge calls involving entities without change

Describe the bug A production application, working with 1.2.1 and ported to 1.3.0.Alpha2 stopped working with the aforementioned Exception during merge.

Expected behavior No HibernateException

Actual behavior An Exception is thrown

Environment (please complete the following information):

• Output of java -version: 1.8.0_152-b16
• Quarkus version or git rev: 1.3.0.Alpha2

Additional context The code and Hibernate version are the same, but something in the Quarkus integration code is driving that difference in behaviour.