Can't search or filter on custom fields

I followed another topic to update my APM index template this way to include custom HTTP headers used in my applications:

setup.template.overwrite: true
  - name: context.request.headers.x-facade-name
    type: keyword
  - name: context.request.headers.x-method-name
    type: keyword
  - name: context.request.headers.x-uid
    type: keyword

I updated my APM index pattern, and these fields are now marked as searchable and aggregatable.
So I can now use them in filters or search areas, but all search results or Kibana dashboards are now empty whenh I use them!
Did I missed something?

Best regards,

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