Message Title

This is still an issue even in 5.1! I'm on WildFly 10.0 and upgraded to Hibernate 5.1 and when cache is enabled I get this just trying to retrieve a single result from a query:
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: MyCompositeKeyPart
	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:124)
	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer$IncrediblySillyJpaMapsIdMappedIdentifierValueMarshaller.getIdentifier(AbstractEntityTuplizer.java:384)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:219)
	at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4633)
	at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4344)
	at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:226)
	at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:276)
	at org.hibernate.type.EntityType.getIdentifier(EntityType.java:455)
	at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:153)
	at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:52)
	at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:627)
	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1943)
	at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1896)
	at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1874)
	at org.hibernate.loader.Loader.doQuery(Loader.java:919)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)
	at org.hibernate.loader.Loader.doList(Loader.java:2610)
	at org.hibernate.loader.Loader.doList(Loader.java:2593)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2422)
	at org.hibernate.loader.Loader.list(Loader.java:2417)
	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371)
	at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
	at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1339)
	at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87)
	at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606)
	at org.hibernate.jpa.internal.QueryImpl.getSingleResult(QueryImpl.java:529)
	... 122 more