Terminating 'heroku local' does not terminate php-fpm processes

[fabioborella-smash]

Do you want to request a feature or report a bug?

Bug

What is the current behavior?

Running heroku local and terminating with control + C does not return to prompt and leaves php-fpm processes from httpd running. This prevents the next call to heroku local to start.
The only way is executing control + C 2 times and then use apachectl stop to terminate 'zombies' processes.

What is the expected behavior?

When terminating with control + C the command should return and terminate httpd and related php-fpm processes.

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Heroku CLI version:
heroku/7.47.4 darwin-x64 node-v12.16.2

OS:
macOS Big Sur 11.0.1

HTTP proxy or company firewall:
no