Required select element with blank option not validating

I have a contact form that was working previously, but with the plugin update, it’s not validating correctly. Two select elements are coded as required with the include_blank option specified, but you can now submit the form without making a selection for either one. The form is here, and the code for the first element is as follows:

[select* SiteRating id:siteRating include_blank "5 - Excellent" "4 - Above Average" "3 - Average" "2 - Below Average" "1 - Poor"]

Thanks!

https://www.ads-software.com/plugins/contact-form-7/