We'll create fresh WordPress site with Tutor LMS Author Ownership Changer – Migrate your Course Author Ownership installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Tutor Learning Management Systems was primarily designed to help you administer and teach eLearning courses online. Now you can change the authorship with this plugin.
Go to modify plugin file: /wp-content/plugins/tutor/blob/master/classes/Course.php
Line# 40 and remove this code
add_filter('wp_insert_post_data', array($this, 'tutor_add_gutenberg_author'), '99', 2);
Now you can change the Author with this plugin.
If you need more assistance, contact me