Issue when replacing of the recaptcha element by fallback challenge.

Problem/Motivation

There is a recaptcha_v3_pre_captcha_element_processused in recaptcha_v3.module.

1. recaptcha_v3_pre_captcha_element_process get called when contact page is loading but $form_state->isProcessingInput() get failed.

2. recaptcha_v3_pre_captcha_element_process does not get called on normal submit (Submit form without fulfil required field).

3. But function recaptcha_v3_pre_captcha_element_process get called on ajax submit (Submit form without fulfil required field).

4. On ajax submit, $form_state->isProcessingInput() returns true, Eventhough, there is not any input has been entered.

5. So $challenge is set after clicking on submit button and recaptcha get appeared, even though form is not validated and trying to submit the form by ajax.

5. Can we add relevant check over there for specific to ajax call So it won't get call or should We check some response from captcha for particular ajax call?