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For example, let's say you ask a question here on Q2A and you forgot to select the category. You will get an error message that you didn't select the category. But you will also have to re-enter a new reCaptcha, which we all know is not fun and the best use of a user's time.

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It's a fair comment. I think it could work that way in theory, by caching the reCAPTCHA HTML between form impressions, but it would require a fair amount of reengineering to do so. I think many sites have the same problem.
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To me it feels like it could be a security flaw if one CAPTCHA could be used for multiple submissions.

However, it's solvable by catching the basic errors (empty fields) with Javascript BEFORE submission (not AJAX).
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