The APCu issue? Can you check:
cat /etc/php/7.4/fpm/conf.d/98-dietpi-nextcloud.ini
That should contain the apc.enable_cli=1.
The APCu issue? Can you check:
cat /etc/php/7.4/fpm/conf.d/98-dietpi-nextcloud.ini
That should contain the apc.enable_cli=1.