This bug affects the following combination:

• enhancement-as-proxy is enabled;
• a lazy to-one association is mapped with @LazyToOne(LazyToOneOption.NO_PROXY);
• the association is with an entity of a Class that has subclasses;
• the association is loaded as a HibernateProxy via EntityType#resolveIdentifier;
• the same proxy is later re-loaded for another association or by Session#load or Session#getReference.

In EntityType#resolveIdentifier, when a HibernateProxy is returned by Session#internalLoad, it sets HibernateProxy#setUnwrap( true ) in this code.

Later, when the same HibernateProxy is retrieved from StatefulPersistenceContext by DefaultLoadEventListener#proxyOrLoad, it gets initialized by this code