ethers.js: Confirmations undefined on response from JsonRpcProvider.sendTransaction

Describe the bug TransactionResponse declared confirmations as required when it appears to be optional. I am hitting some public MATIC mainnet nodes, so not 100% sure if this is a typing issue brought about by the differences in JsonRPC there. I am hitting ethers.providers.JsonRpcProvider.sendTransaction

Reproduction steps

            this.mSecondaryProviders.forEach((aProvider: ethers.providers.JsonRpcProvider): void =>
            {
                console.log("Sending to provider:", aProvider.connection.url);
                aProvider.sendTransaction(lSignedTransaction)
                    .then((aResponse: ethers.providers.TransactionResponse): void =>
                    {
                        console.log(aProvider.connection.url, "succeeded");
                        console.log(aResponse);
                        console.log("Confirmations:", aResponse.confirmations);
                        if (aResponse.confirmations > 0)
                        {
                            lTransactionHash = aResponse.hash;
                        }
                    })
                    .catch((aError: any): void =>
                    {
                        console.error(aProvider.connection.url, " had an error");
                    });
            });

Console output:

Sending to provider: https://rpc-mainnet.matic.network
Sending to provider: https://rpc-mainnet.maticvigil.com
Sending to provider: https://rpc-mainnet.matic.quiknode.pro
Sending to provider: https://matic-mainnet.chainstacklabs.com
Sending to provider: https://matic-mainnet-full-rpc.bwarelabs.com
Sending to provider: https://matic-mainnet-archive-rpc.bwarelabs.com
https://rpc-mainnet.maticvigil.com succeeded
{
  nonce: 170,
  gasPrice: BigNumber { _hex: '0x01a13b8600', _isBigNumber: true },
  gasLimit: BigNumber { _hex: '0x1e8480', _isBigNumber: true },
  to: 'redacted',
  value: BigNumber { _hex: '0x00', _isBigNumber: true },
  data: 'redacted',
  chainId: 137,
  v: 309,
  r: 'redacted',
  s: 'redacted',
  from: 'redacted',
  hash: 'redacted',
  type: null,
  wait: [Function (anonymous)]
}
Confirmations: undefined
https://rpc-mainnet.matic.quiknode.pro  had an error
https://matic-mainnet.chainstacklabs.com  had an error
https://rpc-mainnet.matic.network  had an error
https://matic-mainnet-archive-rpc.bwarelabs.com  had an error

Environment: Node: v16.2 Ethers: v5.3.1

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