Trying to set the "Manage Users" listing headers in the CP via site/settings/users.yaml with:

--- 8< ---
  - name
  - email
  - company
  - value:
    header: Company Name
--- 8< ---

While the company field shows the id (in the CP) as expected, the related field shows nothing.

Manage Users listing

The company field is a collection companies referenced in the site/settings/fieldsets/user.yaml:

--- 8< ---
        max_items: '1'
          - companies
        mode: panes
        type: collection
        width: 50
        display: Company
--- 8< ---

The same problem occurs with company.title, so it is not specific to a user defined field in the collection.

What am I doing wrong?