Similar issue to: https://theme.co/apex/forum/t/content-published-with-cornerstone-not-publishing-appearing-on-live-page/11837/8
When I save using cornerstone or publish out page any updates aren’t showing. I am using Version: 6.5.5 and WP Version: 5.1.1. I and running PHP Version: 5.6.36.
I can DM with details if that would work better.