Forms do not work with https

It appears Mautic has some hard coded http requests in the form renderer. Using the plugin and shortcodes result in this error:

Mixed Content: The page at ‘https://skillit-dev.example.com/instructor-signup/’ was loaded over HTTPS, but requested an insecure script ‘http://mautic.example.com/mtc.js’. This request has been blocked; the content must be served over HTTPS.

Even embedding the form using Automatic script doesn’t work because the mtc.js request is inside some other script. I don’t want to use Manual script embedding because it’s not easy to insert header and body code on individual pages.