Description:
------------
After upgrade to 7.4.0

listen = /run/php-fpm.sock
listen.owner = nginx
listen.group = nginx
listen.mode = 0600

ERROR: [pool php] failed to chown() the socket '/run/php-fpm.sock': Operation not permitted (1)

work only

listen = /run/php-fpm.sock
;listen.owner = nginx
;listen.group = nginx
listen.mode = 0666

Why it happens?
ArchLinux has the same problem.
https://bugs.archlinux.org/task/64683

Test script:
---------------
php-fpm:

listen = /run/php-fpm.sock
listen.owner = nginx
listen.group = nginx
listen.mode = 0600

Expected result:
----------------
Started The PHP FastCGI Process Manager

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