Drag-and-drop: let object disappear

In StoryLine 3 I've created a drag-and-drop interaction where I want an object placed in one of the answer boxes (ja / nee) to disappear. It does not matter whether the answer is right or wrong. 

I tried to set that up through the States. But it works not for all the objects. Can somebody help me to solve this?

(slide is attached)

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