"Hint" feature in choice-response

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Hi Rachel! 
I just saw yesterday that there is a new feature within the choice responses that allows experiment designers to remove the hints from choice responses. I tried it out and it worked for me for one trial, but then when I ran the experiment again, it no longer stopped showing hints (I was trying this out in a dummy experiment with only one trial). I didn't change the code in my response, and this is what it looks like: 
{
  "type": "choice",
  "choices": [
    "F",
    "J"
  ],
  "key_mapping": [
    "F",
    "J"
  ],
  "target": "F",
  "key_only": true,
  "hint": false,
  "feedback": true,
  "feedback_audio": false,
  "instruction": " "
}

I also just tried running it in a new tab on Google Chrome, clearing browser cache and cookies, and creating a new response with the same code as a sort of "refresh" and it still doesn't work. I'm not sure why I'm still getting hints when I have "hint" set to false. Can you help? 
Thank you! 
Grace