As explained in the title, <ai> field sometimes does not return text, resulting in nothing shown on the screen. I looked into the inspector tool and found that in such cases, the response to the request https://app.mochi.cards/api/plugins/ai?text=QUERY is:

{
    "completion": ""
}

I couldn't figure out when this happens (I believe my query is not violating any rules).

Are there any ways to work around this or to regenerate the answer?

(BTW, I think a "re-generate" button for AI field would be useful in many cases, as it is for the Image Search field.)