Mailchimp form does nothing after pressing submit

It’s got to be one of my adblockers, but i’ve disabled anything specifically being blocked about mailchimp in ublock origin etc. and still, nothing.

The JavaScript that Mailchimp provides should really be smarter about this.

Mailchimp’s own troubleshooting guide doesn’t mention the issue at all, which is ridiculous. Another in an increasing number of bad signs about Mailchimp.

Actually it doesn’t seem to be any of the adblockers or CDN changes after all… but this: