Merge of detached, enhanced entity with orphanRemoval = true collection fails since 5.2.13

Description

This is slightly related to the but here we're trying to merge a detached entity.
This worked in 5.2.12. Does not in 5.2.13+ including latest 5.3.0.

The result is

Caused by: org.hibernate.HibernateException: A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance: org.hibernate.bugs.model.Container.elements
	at org.hibernate.engine.internal.Collections.processDereferencedCollection(Collections.java:99)
	at org.hibernate.engine.internal.Collections.processUnreachableCollection(Collections.java:50)
	at org.hibernate.event.internal.AbstractFlushingEventListener.flushCollections(AbstractFlushingEventListener.java:243)
	at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:86)
	at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:38)
	at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1437)
	at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:493)
	at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3207)
	at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2413)