There is a conflict with Yoast plugin,
if you want to quick fix, please follow
Please edit following file on Yoast plugin
wordpress-seo\admin\links\class-link-watcher.php
and commented out the line or remove.
//$content = apply_filters( 'the_content', $content );
and then save/update file,
We are trying to fix the conflict with Yoast plugin without editing Yoast plugin.