Single page of sitemap is blank?

Not sure what happened, but all of a sudden one of my sitemap’s pages is blank. My main “Home” page is fine, and so is the “Dining Room” sub-page, but all of a sudden the “Living Room” just comes up with a blank screen. Seems to be fine when accessed via a web browser.

Any ideas? I have tried clearing the cache in the app as well, but no help…

Thank you for reading!

This also appears in openhab.log whenever I try to access the page via mobile app.

[WARN ] [ ] - Inbound closed before receiving peer's close_notify: possible truncation attack?