Card sorting block - bug?

Hi I think there is a bug in the Rise card sorting interactive block. When yo click the settings button and delete the last number of the Hex value, or highlight and enter a 0, a single digit or press the space bar, the background becomes transparent and the target area and score text also become transparent! So I thought how could this be useful :) I was thinking if you were to ask a reflective type question or a question where there is no right or wrong answer you could do something along the lies of the attached example. I basically used a text block to ask the question, then a checkbox list for the options. Next put a card sorting block with one category and one item. After this put in a conditional continue which is activated by the card being placed on the invisible target!  Check out the demo here:

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