Flow hide dialog with repeated message

Often when I click action menu > Hide, the "Hide post? one dialog box has the text "Please explain why you're hiding this post." repeated several times.
There are five

<label for="flow-moderation-reason">Please explain why you're hiding this post.</label>

I don't know what makes the page stop doing it. I've seen it happen in Chromium too, and also for Delete action if you have the right.

Version: master
Severity: normal

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