Incorrect content of vendor/bin/codecept

Question

I installed older Codeception 2.5 (because of module for PHP framework Yii1) like this:

composer require codeception/codeception:2.5.*

And then executed:

php vendor/bin/codecept run unit --coverage-html

And nothing happened. I can only see following code. I discovered that all 3 files (carbon, codecept, phpunit) in folder vendor/bin contain only this instead of PHP code:

#!/usr/bin/env sh

dir=$(cd "${0%[/\\]*}" > /dev/null; cd '../codeception/codeception' && pwd)

if [ -d /proc/cygdrive ]; then
    case $(which php) in
        $(readlink -n /proc/cygdrive)/*)
            # We are in Cygwin using Windows php, so the path must be translated
            dir=$(cygpath -m "$dir");
            ;;
    esac
fi

"${dir}/codecept" "$@"

Why is that? I am using Ubuntu 16 in Vagrant (CognacBox image). If I use XAMPP and Windows 10 it works correctly. I used Composer v1 and v2. Both with the same problem.