Last beta allow multiple PHP but it fails to connect to mysql

I’d set a custom vhost for a test site, on new devilbox 3.0.0. beta, it works i can change the php-fpm with different versions of php, but when i do this my test page with a PDO connection to mysql fails with following error:

2023/02/20 14:08:02 [error] 649#649: *1 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught PDOException: SQLSTATE[HY000] [2002] Connection refused in /shared/httpd/my_project/htdocs/index.php:23

Any idea?

Anyone has any idea about that i did some test but with no luck?