Drag and Drop items won't drop if not dragged

I have a scenario where I want students to drag clothes out of a closet and into a suitcase.  I want all of the clothes to be draggable, but not all of them to be moved to the suitcase.

The correct answer is the t-shirt, jeans, sweater, and winter gear.  However, when all four correct items are moved into the suitcase, the answer is not recognized as correct if the swimsuit and miniskirt aren't at least clicked - the interaction seems to think their starting location is not correct.

I can't just take these two items out of the interaction, because then they won't be draggable and it would be laughably obvious what the correct answer is.  Does anyone have a solution?

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