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Debian 12 ships with php 8.2, while Debian 11 ships with php 7.4.
Although Debian 12 starts the php8.2-fpm service by default after an OS
upgrade, you still need to copy the old php-fpm config file and restart
php8.2-fpm service, so that php-fpm listens on same network address
(127.0.0.1:9999) and Nginx can communicate with php-fpm:
cp /etc/php/7.4/fpm/pool.d/www.conf /etc/php/8.2/fpm/pool.d/www.conf
service php8.2-fpm restart