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 the 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.