Filecoin.ChainGetTipSet@v2 not working with lotus-gateway

[hanabi1224]

Describe the bug

To reproduce

API version: v2
payload:

{
    "jsonrpc": "2.0",
    "method": "Filecoin.ChainGetTipSet",
    "params": [
			{
        "height": {
          "anchor": {
						"key": null
          },
          "at": 3435097,
          "previous": true
        }
      }
    ],
    "id": 123
}

forest response: normal
gateway backed by forest response: JSON-RPC error:\n\tcode: -32602\n\tmessage: error deserializing parameter\n\tdata: {\"error\":\"missing field key\",\"index\":0,\"name\":\"tipsetSelector\",\"type\":\"forest::lotus_json::LotusJson<forest::rpc::types::tipset_selector::TipsetSelector>\"}\n

1. Go to '...'
2. Run '....'
3. See error

Log output

Log Output

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Expected behaviour

Screenshots

Environment (please complete the following information):

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• Hardware

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