"Preview Changes" button shows last saved version and not pending changes

Hello, I have a subdomain network using the domain mapping plugin with pretty URL permalinks and have noticed that the “Preview Changes” button does not actually show any pending changes. Instead, it opens a new tab/window and displays the last saved version of the post. I tried this on another subdomain network without the domain mapping plugin, and it worked fine. This leads me to believe it may be an issue with domain mapping.

Initially, one of the editors was getting a “You do not have permission to preview drafts” error message when trying to preview changes. I discovered a way around this. In my domain mapping plugin settings I have both “Remote Login” and “Redirect administration pages to site’s original domain” checked. Then, before previewing a published article, if you preview a “draft” status article, all the remote login redirects take place so you don’t get the error message.

However, the “Preview Changes” button still does not show the pending changes—only the last saved version. I’m confused at this point. Anyone else run into a similar problem? Thank you.