I’m currently testing the new Gutenberg plugin with my own developed theme and plugin. My theme has a custom meta box with an action for the user. Once the user click this action the post content is completely deleted and a new ‘custom’ content is added to the default tinyMce editor.
Example: tinymce.get(“content”).setContent(“my custom content”);
This of course does not work anymore with the new Guteberg Editor and I’m struggeling to find a solution.