Character count error with php 8

Where can we see the website in question?

Hi Takayuki

this is the website?https://supportinternet.com.ar/debito-automatico/

you will not be able to see the error because I revert php to 7.4 and now works fine.

I tried everything before writing to you and only reverting php solved it.

tks for your feedback

What error do you see?

The field was marked as not filled out and the form was not submitted. Just changing PHP to 7.4 solved the problem automatically.

What other plugins and theme do you use on the site?

From the questions you ask me, I understand that you have the hypothesis that it is not the PHP version that generates the error. I will give you the list of plugs, themes and snippets soon. It is an honor for me to be in feedback with you, I respectfully ask you to accept this direct question: have you tested if the character length works in PHP 8.1.22?