symfony: Dumps in commands don't display their location

Symfony version(s) affected: 4.4

Description
In #31446 we added a feature to show the file path and line number where the dump() or dd() call was made inside a command. However, I cannot make it work.

How to reproduce

# create a 4.4 project
$ symfony new test_dumper --full --version=4.4.x-dev

# create a command
$ php bin/console make:command app:test-dumper

# edit the command file and add dd() or dump() somewhere

# run the command
$ php bin/console app:test-dumper

This is what I see:

The output is the same as in the previous Symfony versions, so this feature is not working as expected.