Embedded Assignments Not Allowing Submissions

[morisy]

A user had an Assignment embedded on a third party site with this code:

<iframe src="https://www.muckrock.com/assignment/where-did-your-money-go-340/embed/" width="100%" height="600px"></iframe>

The embed showed up, but upon submission Chrome had an error:

And safari wouldn't do anything when clicking submit.

Looks like this might be the culprit?

In the meantime, having them use an external link rather than embed.