This is a continuation of Page layout and content disappearing when editor saves if you could open that again if possible?
You can see what happens here, https://drive.google.com/open?id=1OHr9lRYRYxj_ioO7ex0rrGrELb2-WnLn&authuser=tim%40newflight.co&usp=drive_fs
Same issue for headers, footers, blog archive, and blog posts. It’s very hard to recreate as it will randomly happen. As an editor tries to update a layout, once they refresh the page, all content disappears and it loses it’s display criteria, defaulting to “today” as the only criteria options.
This is on a multisite if that helps.