Table sort ignores "field", always adds header title as order query parameter

If I create a sortable table with the following header definition then the rendered link of "Foo bar" table header contains the ?order=Foo%20bar instead of ?order=baz.

    $headers['foobar'] = [
      'data' => $this->t('Foo bar'),
      'field' => 'baz',
      'sort' => 'desc',
    ];