Form still sends email with recaptcha blocked for GDPR

Hi,
in my site umbriafiere.it inside the contact page I'm using the Form Builder widget with the recaptcha enabled. When in another GDPR component an user choose to use only the necessary cookies and therefore the recaptcha cookie is disabled the form still sends the emails. Instead my expectation was to receive an error message given that it is impossible to make the recaptcha verification. Can you please indicate a way to prevent the submit of the form if the recaptcha is disabled for GDPR reasons?
Thanks in advance for the support.
Best regards.