mikezielonka

/**
 * Plugin Name: Web Stories Additional GA Tracking
 * Description: Mini-plugin to add an additional Google Analytics tracking code to web stories
 * Plugin URI: https://wp.stories.google/
 * Author: Pascal Birchler, Google
 * Author URI: https://opensource.google.com/
 * Version: 0.0.1
 * License: Apache License 2.0
 * License URI: https://www.apache.org/licenses/LICENSE-2.0

mikezielonka

<?php
function remove_post_thumbnail($metadata, $object_id, $meta_key, $single){
	
	if( isset($meta_key) && '_thumbnail_id' === $meta_key && is_single() )
		return false;
	else
		return $metadata;
    }
add_filter('get_post_metadata', 'remove_post_thumbnail', true, 4);