I used the page editor to build a page. I saved the page. I saved the page numerous times as I was building the page. I saved the page as a template, twice in the course of building the page. I reloaded the cornerstone page editor, the content is gone from the builder, despite still being visible on the front end, and the template is not accessible from the page editor, despite existing when you go to templates.
I tried creating a new page to see if the templates I’d created were accessible from that new page. They were not.
I’m experiencing this issue on
WP 5.9.3
Pro Theme 5.1.5
PHP 7.4.29
I experience this issue with no child theme or plugins of any kind activated, so it is NOT a plugin or theme conflict.