Our website is updated to:
Wordpress 5.6
PHP 8.0
X 8.0.10
cornerstone: 5.0.10
Then we found a lot of warnings (debug mode on) like:
Deprecated : Required parameter $id follows optional parameter $key_prefix in /var/www/html/www.mymvc.net/wp-content/plugins/cornerstone/includes/utility/element-api.php on line 87
Site:
http://www.mymvc.net/
Does it indicate any compatibility issue?