Centos 7 , installed apache in mpm event mode and php-fpm

I decided to try the pm ondemand mode for php-fpm set the option

pm.process_idle_timeout = 2s 

I turned on the htop utility and watch the php-fpm processes. It can be seen that they are created, but not destroyed after 2 seconds, as it should be in theory ...

If we put say the option

 pm.max_requests = 50 

Then the processes will be gradually killed ... But why does not the pm.process_idle_timeout work?

Or globally, I do not understand something?

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