Hover over a shape to change its state to hidden NOT WORKING

Hi, I need help with this. It is a simple setup. I put a rectangle shape over a word. Then I added a trigger to change the state of the shape to hidden whenever the mouse hovers over it. However, the shape just kept blinking when hovered instead of getting invisible. I am using the latest version of Storyline 3. Is it a known bug? Appreciate any help! 

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