Hidden Drop Target Still Accepts Drag Item

I am working on a drag and drop slide using the freeform, but I'm not using hotspots. I hide the 'drop target' object after the correct drag object has been dropped on it. However, even after hiding, I can still drop another drag object on hidden 'drop target'. (I need to have the 'Return item to start point if dropped outside' set to 'any drop target').  Is this a bug or is this how it functions? Is there a way to stop the hidden drop target from continuing to function? 

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