Debug-Microtask-Race-V2

The model receives the prompt (and optional system message). The run uses scorer rubric_json_metrics with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Return JSON only with keys diagnosis, fix, tests. A state machine schedules Promise.resolve().then(commit) while a synchronous rollback can run first, leaving committed stale state. Identify the race and fix.

{
  "metrics": {
    "repro": {
      "checks": [
        {
          "contains": [
            "rollback"
          ]
        },
        {
          "contains": [
            "stale state"
          ]
        },
        {
          "contains": [
            "microtask"
          ]
        },
        {
          "contains": [
            "commit"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "version token"
          ]
        },
        {
          "contains": [
            "cancel"
          ]
        },
        {
          "contains": [
            "sequence"
          ]
        }
      ]
    },
    "diagnose": {
      "checks": [
        {
          "contains": [
            "race"
          ]
        },
        {
          "contains": [
            "state machine"
          ]
        },
        {
          "contains": [
            "Promise.resolve"
          ]
        }
      ]
    }
  }
}