SELECT field default blank

Hi
In your previous version I could have a ‘required’ select field with the default as a blank and with a list of options.
If the user did not select one of the options a warning would appear when the submit button was clicked.

This new version defaults to the first option on the list.

using default = 0 does not work though choosing default 1,2,3 etc does.

Can you make a default = 0 option please

https://ww.wp.xz.cn/plugins/si-contact-form/