Panther tests interfering with Symfony dev server environment

[nacholibre]

I always have the Symfony dev server symfony server:start -q running in the background during development. However, when I run PHPUnit tests with Panther, it connects to the already running dev server instead of starting its own server. As a result, the tests run in the dev environment instead of the test environment.

Is this the intended behavior?
Is there a way to run Panther tests in the test environment while keeping the Symfony dev server running in the dev environment without interference?

Thank you for your help!