Collection: Filters works well on the homepage but breaks under tags section

Thanks for jumping in John. You explanation is very clear and I understand where I messed up.

I’m applying this yaml but no filtering occurs on https://mysite.com/en/

To be clear about my domains:

routes:
  /:
    # Filters out few tags from Ghost's homepage
    controller: channel
    filter: tag:-[how-to,about,under-the-hood]

collections:
  /:
    permalink: /{slug}/ 
    template:
      - index

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

Thank you!