Sometimes when I do session.refresh(self) a foreign field 
self.ProductionOrder is sometimes a different object than before. I have 
non-database fields on ProductionOrder that are lost. I have 
expire_on_commit=False so I expect an object corresponding to a database 
row to persist. Debugging, I see that this object replacement occurs after 
self.refresh(). I haven't determined the conditions under which it occurs. 
Any thoughts?

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