3.0.1 with blank Snippet Editor and Content Analysis

Yoast SEO was automatically updated to 3.0 on several sites, and now every site that has standard content editor removed with script below won’t show Snippet Editor or Content Analysis information at all. Looks like this:
https://www.dropbox.com/s/l36ircs9s30lisd/yoast-seo-problem.png?dl=0

Script to remove the standard content editor:

add_action('init', 'remove_content_editor');

function remove_content_editor() {
    remove_post_type_support( 'page', 'editor' );
}

Browser and WordPress caches have been emptied. Only thing that has helped was to remove the script above from functions.php, but that is not a solution.

I have not experienced any javascript errors.

https://wordpress.org/plugins/wordpress-seo/