Nondescript errors in durable objects

{
  "source": {
    "level": "error",
    "message": "2025-07-03T22:46:52.199Z",
    "$cloudflare": {
      "$metadata": {
        "id": "01JZ97HA33PD5CF5VEGFF8K004",
        "type": "cf-worker-event",
        "error": "2025-07-03T22:46:52.199Z",
        "messagePattern": "<DATETIME>"
      }
    }
  },
  "dataset": "cloudflare-workers",
  "timestamp": "2025-07-03T22:46:52.259Z",
  "$workers": {
    "diagnosticsChannelEvents": [],
    "truncated": false,
    "event": {
      "scheduledTime": "2025-07-03T22:46:52.199Z"
    },
    "scriptName": "xxxx",
    "outcome": "exception",
    "eventType": "alarm",
    "entrypoint": "SubscriptionHandler",
    "scriptVersion": {
      "id": "bea20e32-91de-45ba-a2b5-152c405b4220"
    },
    "executionModel": "durableObject",
    "requestId": "H9HJJI8K9VTYY4LO",
    "wallTimeMs": 125,
    "cpuTimeMs": 0
  },
  "$metadata": {
    "id": "01JZ97HA33PD5CF5VEGFF8K004",
    "requestId": "H9HJJI8K9VTYY4LO",
    "trigger": "2025-07-03T22:46:52.199Z",
    "service": "xxxx",
    "level": "error",
    "error": "2025-07-03T22:46:52.199Z",
    "message": "2025-07-03T22:46:52.199Z",
    "account": "0aa01c659fc5341ca4bd310ea9482c22",
    "type": "cf-worker-event",
    "fingerprint": "0c9738a5af1748c48cd0f2db27fce9c0",
    "origin": "alarm",
    "messageTemplate": "<DATETIME>"
  },
  "links": []
}