GraphQL bulk mutation "Timeout on validation of query"

[cloudev0]

I notice when using GraphQL bulk mutation, sometimes the mutation result file has this error. Usually only one of the many products uploaded via the mutation file is affected. Why does this occur? What's the proper way to handle this?

{
  "data": { 
    "productUpdate": {
      "userErrors": [{ 
        "message": "Timeout on validation of query",
        "field": ["query"],
        "type": "GraphApi::Admin::BulkMutationUserError",
        "code": null,
        "extra_info": null
      }]
    }
  },
  "__lineNumber": 15717
}

Thanks in advance.