Background tasks cannot work

When I add APCu(‘memcache.local’ => ‘\OC\Memcache\APCu’,)to “config.php”, the background tasks will not work properly. After removing APCu(‘memcache.local’ => ‘\OC\Memcache\APCu’,), the background tasks can be used. Why?

I used Nextcloud 23.0.0 Ubuntu20.0.4 LTS