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It helps when setting the post type to public to debug something

includes/class-activitypub.php

@@ -535,7 +535,6 @@ private static function register_post_types() {
 				'query_var'           => false,
 				'delete_with_user'    => true,
 				'can_export'          => true,
-				'supports'            => false,
 				'exclude_from_search' => true,
 			)
 		);