Has anyone come across the ReCaptcha Error code "*incorrect-captcha-sol*" when running on a form like Contactus/Login/Register in SCA site? Google ReCaptcha server side validation retuns a random error

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{
  "success": false,
  "error-codes": [
    "incorrect-captcha-sol"
  ]
}

which is not even mentioned in the Google ReCaptcha documentation (https://developers.google.com/recaptcha/docs/verify#error_code_reference). Any previous experinece with the same error code ? Any suggestions ?