Drush 10 and config-split command not working

Scenario
- Drupal 8.8.4
- Drush 10.2.2
- Drush Launcher 0.6.0

If I use:
drush config-split:import dev

This error appears:
There are no commands defined in the "config-split" namespace.

drush cim or cex is working and also the spliting. But I can't use config-split:...

Same with config_split:import dev. Because in the docs it's written different:
- https://www.drupal.org/docs/8/modules/configuration-split/creating-a-sim...
- https://www.drupal.org/docs/8/modules/configuration-split/cli-integration

Any idea?