I’m update my installation from 11.0.3 to 12.0.0 according the guidenance and running now in trouble with
apps directory not found! Please put the Nextcloud apps folder in the Nextcloud folder or the folder above. You can also configure the location in the config.php file.
I extended my config.php with
array ( 0 => array ( 'path' => '/apps/www/url/nextcloud/apps', 'url' => '/apps', 'writable' => true, ), ),
and restarted nginx more than once.