php please doesn't work in different locale

When installing a fresh Statamic site using statamic new [name], clear the created site with php please clear:site and changing the locale in index.php and settings.yaml to another than the default en any php please command throws up this error:

[ErrorException] Undefined index: en

When I change the shorthand of locales part in settings.yaml back to the default I can use the php please commands, but surely it is not logical...

locales:
  en:
    full: nl_NL
    name: Nederlands
    url: /