php-fpm.service fails to start after upgrading to php 7.4.0. Using the default configuration files.

systemctl status php-fpm.service:

systemd[1]: Starting The PHP FastCGI Process Manager...
php-fpm[10704]: [ERROR] [pool www] failed to chown() the socket '/run/php-fpm/php-fpm.sock': Operation not permitted (1)
php-fpm[10704]: [ERROR] [pool www] failed to chown() the socket '/run/php-fpm/php-fpm.sock': Operation not permitted (1)
php-fpm[10704]: [ERROR] FPM initialization failed
php-fpm[10704]: [ERROR] FPM initialization failed
systemd[1]: php-fpm.service: Main process exited, code=exited, status=78/CONFIG
systemd[1]: php-fpm.service: Failed with result 'exit-code'.
systemd[1]: Failed to start The PHP FastCGI Process Manager.