is there a bug with signMessageOfBIP322Simple

[zhangliugang]

I cloned this repo and create a new test

  it('bip322-simple 2', async () => {
    const wallet = new LocalWallet("L3VFeEujGtevx9w18HD1fhRbCH67Az2dpCymeRE1SoPK6XQtaN2k", AddressType.P2WPKH, NetworkType.MAINNET);
    expect(wallet.address).eq("bc1q9vza2e8x573nczrlzms0wvx3gsqjx7vavgkx0l");
    const signature = await wallet.signMessage("", "bip322-simple");
    expect(signature).eq('AkcwRAIgM2gBAQqvZX15ZiysmKmQpDrG83avLIT492QBzLnQIxYCIBaTpOaD20qRlEylyxFSeEA2ba9YOixpX8z46TSDtS40ASECx/EgAxlkQpQ9hYjgGu6EBCPMVPwVIVJqO4XCsMvViHI=')
    
    const signature2 = await wallet.signMessage("Hello World", "bip322-simple");
    expect(signature2).eq('AkcwRAIgZRfIY3p7/DoVTty6YZbWS71bc5Vct9p9Fia83eRmw2QCICK/ENGfwLtptFluMGs2KsqoNSk89pO7F29zJLUx9a/sASECx/EgAxlkQpQ9hYjgGu6EBCPMVPwVIVJqO4XCsMvViHI=')
  });

these two cases is provided by https://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki and the signature seems not correct at all