SaltStack - SLS requisite ordering fails

a.sls

include:
  - second

first.sls

include:
  - second

3-first:
  test.nop

second.sls

include:
  - first
  - third

2-second:
  test.nop:
    - require:
      - sls: first

third.sls

include:
  - second

1-third:
  test.nop:
    - require:
      - sls: second

zz-result.out

1-third:
    ----------
    __env__:
        base
    __sls__:
        third
    test:
        |_
          ----------
          require:
              |_
                ----------
                sls:
                    second
        - nop
        |_
          ----------
          order:
              10001
2-second:
    ----------
    __env__:
        base
    __sls__:
        second
    test:
        |_
          ----------
          require:
              |_
                ----------
                sls:
                    first
        - nop
        |_
          ----------
          order:
              10002
3-first:
    ----------
    __env__:
        base
    __sls__:
        first
    test:
        - nop
        |_
          ----------
          order:
              10000