API 400 death loop with function response

I've now hit this 3 times in the last couple of days. Once its in this loop, gemini cli will not respond to any prompts. I must delete tmp folders.

[API Error: [{
    "error": {
      "code": 400,
      "message": "Please ensure that the number of function response parts is equal to the number of function call parts of
  the function call turn.",
      "errors": [
        {
          "message": "Please ensure that the number of function response parts is equal to the number of function call
  parts of the function call turn.",
          "domain": "global",
          "reason": "badRequest"
        }
      ],
      "status": "INVALID_ARGUMENT"
    }
  }
  ]]

Start by reproducing the Gemini CLI 400 error involving mismatched function response and function call parts. Inspect the temporary folders involved in recovery and determine what state persists after the loop; done means the CLI accepts subsequent prompts without requiring those folders to be deleted.