Copy and paste of a subflow instance should not be creating new subflows in the palette. Of it is, that is a bug that needs fixing. (Currently stood in the immigration line in San Fran so can't check right now).
If you import a subflow, it will always create a new one - maybe it should attempt to see if an identical subflow already exists. Current approach is the safe one... Assume everything being imported is 'new'.
Nick
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