Hi, I’m replying here because we probably have a similar problem and I can’t see the helpdesk communication.
We also have the problem in two projects that the content of meta fields is not output. Both projects have in common that the post types and meta fields were created using JetEngine.
Looking at the screenshot of the backend in the answer above, I would assume that JetEngine is also used there. I suspect there is a conflict between the JetEngine meta fields and the content control.
We recently upgraded to a Version > 2.2.x and are now temporarily back to 2.1.0 where it works for us.