Invalid callbacks not being called ?

Hi! I’m trying to use the jQuery callback invalid.wpcf7, but can’t seem to get it to work. I do however get submit.wpcf7 to run, but anything else besides that point (spam.wpcf7, invalid.wpcf7, mailsent.wpcf7, mailfailed.wpcf7) won’t be called.

Anyone have any idea why ?

Thanks!

https://wordpress.org/plugins/contact-form-7/