Custom Post Types that do not use an editor should continue to work like they did previously, although there are various settings they can use when creating the post types which may affect what editor screen comes up.
Hi, thanks Marius where I can find the variable for custom post type who change on Gutenberg?
Kind Regards
There are multiple ways, whatever introduces the CPT might disable the new editor using a filter, by including meta boxes that declare that they do not support the new editing experience, or by setting the show_in_rest value on the CPT it self to false, so it’s a bit hard to say exactly which one is being used. (those are just off the top of my head).
The last reply at https://github.com/WordPress/gutenberg/issues/4409#issuecomment-408315024 has some links and resources which should hopefully also help you, please do let me know if any of the resources linked to are confusing or not working for you though!
