Custom sound not playing when live activity is updated

 

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{"aps":{"alert":"hi some message","badge":42, "sound": "sound.caf"}}

{
  "aps": {
    "timestamp": 1666771735,
    "event": "update",
    "alert": "hi some message",
    "sound": "sound.caf",
    "content-state": {}
  }
}