Ignition 3.x, trying to merge a non-existing fragment, hard-failing in 60 seconds

ignition-merge-404-capped.json

{
  "ignition": {
    "version": "3.1.0",
    "config": {
      "merge": [
        {
          "source": "https://example.com/this-is-supposed-to-be-404"
        }
      ]
    },
    "timeouts": {
      "httpTotal": 60
    }
  }
}