Multi-language content-routing does not work correctly

Developer help Routing
1

Hello, I have tried following this, but it does not seem to be working.

Here’s my routes.yml:

    routes:

    collections:
      /:
        permalink: /{slug}/
        template: index
        filter: 'tag:-hash-de'
      /de/:
        permalink: /de/{slug}/
        template: index-de
        filter: 'tag:hash-de'

    taxonomies:
      tag: /tag/{slug}/
      author: /author/{slug}/

On the main page I only want to be able to see English content, but a German article (with #de) tag is visible:
image
Similarly, on the /de page both articles are visible, even the English one:
(I can’t embed two images, here’s the other one: https://ibb.co/jT4cvGb )

I don’t really know what I did wrong (I spend like two hours playing around with different tags), help would greatly be appreciated.