After some testing, yes, it needed another sort, thanks.

However, I seem to be getting only a single chain tip (the latest block), probably because I'm connected to a single node only. This is my output:
$ bitcoin-cli getchaintips
[
  {
    "height": 432407,
    "hash": "0000000000000000015ef5f0c0aba9e0697b38010b50eb0beaf7f795416440a6",
    "branchlen": 0,
    "status": "active"
  }


As an open question, what is the maximum number of Bitcoin blockchain tips (single fork) you ever observed?