HardhatにてERC721デプロイの際のエラーが解決できません。

Question

現在以下の記事を参考に、ERC721の開発を試みています。

https://blog.opensphere.co.jp/posts/dapps003

●環境
vagrant - ubuntu
Hardhat(Solidity)
Openzeppelin

以下のコマンドでデプロイをしようとするとエラーが出るのですが、解決できません。

$ npx hardhat deploy --network online

**Error: ERROR processing /vagrant_data/testnft/deploy/MyERC721.ts:

TypeError: Cannot read property 'toString' of undefined**
at DeploymentsManager.onPendingTx (/vagrant_data/testnft/node_modules/hardhat-deploy/src/DeploymentsManager.ts:503:35)
at _deploy (/vagrant_data/testnft/node_modules/hardhat-deploy/src/helpers.ts:588:16)
at _deployOne (/vagrant_data/testnft/node_modules/hardhat-deploy/src/helpers.ts:768:16)
at Object.deploy [as func] (/vagrant_data/testnft/deploy/MyERC721.ts:19:22)
at DeploymentsManager.executeDeployScripts (/vagrant_data/testnft/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1049:22)
at DeploymentsManager.runDeploy (/vagrant_data/testnft/node_modules/hardhat-deploy/src/DeploymentsManager.ts:885:5)
at Environment._runTaskDefinition (/vagrant_data/testnft/node_modules/hardhat/src/internal/core/runtime-environment.ts:217:14)
at Environment.run (/vagrant_data/testnft/node_modules/hardhat/src/internal/core/runtime-environment.ts:129:14)
at SimpleTaskDefinition.action (/vagrant_data/testnft/node_modules/hardhat-deploy/src/index.ts:528:32)
at Environment._runTaskDefinition (/vagrant_data/testnft/node_modules/hardhat/src/internal/core/runtime-environment.ts:217:14)
at DeploymentsManager.executeDeployScripts (/vagrant_data/testnft/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1052:19)

関係するソースは以下の通りです。

contracts/MyERC721.sol

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/presets/ERC721PresetMinterPauserAutoId.sol";

contract OwnableDelegateProxy {}

contract ProxyRegistry {
    mapping(address => OwnableDelegateProxy) public proxies;
}

contract MyERC721 is ERC721PresetMinterPauserAutoId {
    address proxyRegistryAddress;

    constructor(
        address _proxyRegistryAddress,
        string memory _name,
        string memory _symbol,
        string memory _baseTokenURI
    )
        ERC721PresetMinterPauserAutoId(_name, _symbol, _baseTokenURI)
    {
        proxyRegistryAddress = _proxyRegistryAddress;
    }

    function isApprovedForAll(address _owner, address _operator)
        public override view returns (bool)
    {
        ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress);
        if (address(proxyRegistry.proxies(_owner)) == _operator) {
            return true;
        }

        return super.isApprovedForAll(_owner, _operator);
    }
}

deploy/MyERC721.ts

import {HardhatRuntimeEnvironment} from 'hardhat/types';
import {DeployFunction} from 'hardhat-deploy/types';
import assert from "assert";

assert(process.env.PROXY_REGISTRY_ADDRESS);
assert(process.env.TOKEN_NAME);
assert(process.env.TOKEN_SYMBOL);
assert(process.env.TOKEN_BASE_URI);

const deploy: DeployFunction = async function ({
    getNamedAccounts,
    deployments,
    getChainId,
    getUnnamedAccounts
}: HardhatRuntimeEnvironment) {
    const { deploy, execute } = deployments;
    const { deployer } = await getNamedAccounts();

    const MyERC721 = await deploy("MyERC721", {
        from: deployer,
        args: [process.env.PROXY_REGISTRY_ADDRESS, process.env.TOKEN_NAME, process.env.TOKEN_SYMBOL, process.env.TOKEN_BASE_URI],
        log: true,
    })
    console.log('MyERC721: ' + MyERC721.address);

    await execute('MyERC721', {from: deployer}, 'mint', deployer);
}

export default deploy;

node_modules/hardhat-deploy/src/DeploymentsManager.ts

  // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
  public async onPendingTx(
    tx: TransactionResponse,
    name?: string,
    // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
    deployment?: any
  ): Promise<TransactionResponse> {
    if (
      this.db.writeDeploymentsToFiles &&
      this.network.saveDeployments &&
      this.db.savePendingTx
    ) {
      const deployFolderPath = path.join(
        this.deploymentsPath,
        this.deploymentFolder()
      );
      console.log("tx", tx.hash);
      const pendingTxPath = path.join(deployFolderPath, '.pendingTransactions');
      fs.ensureDirSync(deployFolderPath);
      const rawTx = tx.raw;
      console.log(tx);
      const decoded = tx.raw
        ? undefined
        : {
            from: tx.from,
            gasPrice: tx.gasPrice.toString(),
            gasLimit: tx.gasLimit.toString(),
            to: tx.to,
            value: tx.value.toString(),
            nonce: tx.nonce,
            data: tx.data,
            r: tx.r,
            s: tx.s,
            v: tx.v,
            // creates: tx.creates, // TODO test
            chainId: tx.chainId,
          };
      this.db.pendingTransactions[tx.hash] = name
        ? {name, deployment, rawTx, decoded}
        : {rawTx, decoded};
      fs.writeFileSync(
        pendingTxPath,
        JSON.stringify(this.db.pendingTransactions, null, '  ')
      );
      // await new Promise(r => setTimeout(r, 20000));
      const wait = tx.wait.bind(tx);
      tx.wait = async () => {
        const receipt = await wait();
        // console.log("checking pending tx...");
        delete this.db.pendingTransactions[tx.hash];
        if (Object.keys(this.db.pendingTransactions).length === 0) {
          fs.removeSync(pendingTxPath);
        } else {
          fs.writeFileSync(
            pendingTxPath,
            JSON.stringify(this.db.pendingTransactions, null, '  ')
          );
        }
        return receipt;
      };
    }
    return tx;
  }

恐らくDeploymentsManager.tsのonPendingTx関数内のtxが未定義なのだと思いますが、解決方法がわかりません。

よろしくお願いします。