Disable auto replace mixed content for one page

Hello!
I have a form embedded into one page on our site. The form action URL needs to be HTTP, but the auto replace mixed content is changing HTTP to HTTPS.

How can I make sure this form action URL remains HTTP? Can I disable the ‘auto replace mixed content’ on this one page?

This used to work before, but with the most recent update, this form URL is now being forced to HTTPS.

Thanks:)