Possible fixes for 3.6.9 that may work for other versions as well:

EntityEntry @ line 255, replace

public Object getLoadedValue(String propertyName) { int propertyIndex = ( (UniqueKeyLoadable) persister ).getPropertyIndex(propertyName); return loadedState[propertyIndex]; }

by

public Object getLoadedValue(String propertyName) {
int propertyIndex = ( (UniqueKeyLoadable) persister ).getPropertyIndex(propertyName);
if (loadedState == null) { return null; }
return loadedState[propertyIndex];
}

public Object getLoadedValue(Object entity, String propertyName) {
int propertyIndex = ( (UniqueKeyLoadable) persister ).getPropertyIndex(propertyName);
if (loadedState == null) { loadedState = getPersister().getPropertyValues( entity, entityMode ); }
return loadedState[propertyIndex];
}

To make this work also replace line 233 in org.hibernate.engine.Cascade with:

loadedValue = entry.getLoadedValue( parent, propertyName );

Using the test case by Patras Vlad this fix works. I also attached the files to this issue.
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