When using WP 5.0.2 and the new editor with PRO 2.4.4 a post that has been switched to lets say a Video post type is failing to display the correct settings panel for the post type when the new gutenburg editor is in place. Simply using the official ‘Classic Editor’ Plugin solves the problem.
I saw this on a Client site and then have tested this workaround on a clean wp install and the problem is resolved so it appears to me to be a PRO issue that needs resolution.