Reply To: Custom Post Type and Custom Field Type Unaccessible

I see, can you please go to some tool like phpMyadmin and update the post type to mb-post-type, like in this screenshot: https://i.imgur.com/zzZ5KhL.png

And also check for postmeta title, find the rows with post_id = your custom post type ID (in my screenshot above, it's 126) and check + fix the meta value: https://i.imgur.com/TCT0OJz.png

Sorry for this thing, I'm not sure why that happens. I saw this bug once, but now I can't replicate it :(.