Problem
drupal/phpcs-standard picks the first available standard matching Drupal.*, so having DrupalPractice installed in tandem with Drupal (coder.module) causes the first to be selected and you loose all rules provided by Drupal.
Suggested solution
One of the following:
- Provide all standards using
phpcs --standard=Drupal,DrupalPractice (Yes, it's possible to provide several).
- Extract the available standards as a configuration letting the user select which to use.