Incompatibility between Web3Auth and Biconomy w/ React TS (error while getting transaction receipt)

Describe the bug

I want to use Biconomy + Web3Auth in a Next.js typescript project, and I found an issue with the provider interfaces. I am using web3 1.7.3, @web3auth/web3auth 2.0.2, @biconomy/mexa 3.0.4

This is the way I initialize Web3Auth + Biconomy (classic way):

const web3auth = new Web3Auth({
  clientId,
  chainConfig: {
    chainNamespace: "eip155",
    chainId: "0x13881",
    rpcTarget: "https://polygon-mumbai.infura.io/v3/{INFURA_PROJ_ID}",
  },
})
await web3auth.initModal()

if (web3auth.provider) {
  const biconomy = new Biconomy(web3auth.provider, {
    apiKey: apiKey,
    debug: true,
    contractAddresses: [HelloWriter],
  })
  await biconomy.init()
}

After init, I wish to call a contract function using biconomy.provider (which comes from the web3auth.provider). The call actually works, and the transaction is mined (in the Biconomy debug logs, I can see Tx Hash mined message received at client with id...), however the eth_getTransactionReceipt call fails:

invalid argument 0: json: cannot unmarshal non-string into Go value of type common.Hash

I am suspecting an incompatibility between the web3auth provider (which is expected to be EIP1193) and the ExternalProvider interface used within Biconomy.

I know that @shahbaz17 made a working example of Web3Auth + Biconomy (https://github.com/shahbaz17/biconomy-web3auth-example), and I can also reproduce it on my side, but I can't figure out how to make it work in a Typescript React environment (tested both with Next and vanilla React), built with the NPM packages and not using the ones from the CDN.

It is worth noting than when I switch to ethers.js (while doing exactly the same thing), the transaction doesn't succeed: it is broadcast to the RPC node, but it fails.

To Reproduce

I am using Web3Auth's nextjs-evm-web3auth-example template as a basis, on top of which I have only added the Biconomy conf, as well as a very simple call to a ERC2771-enabled ERC721 contract. This is the repo: https://github.com/mdr-altdev/web3auth-biconomy-poc

This is deployed on Vercel: https://web3auth-biconomy-poc-eu5k.vercel.app/ -> After logging in (whether with Metamask or social login), click "Mint NFT" to reproduce

Expected behavior

I would expect the eth_getTransactionReceipt request made by the provider not to fail, and receive a proper notification when the tx goes through.

Screenshots

Here are the logs that I get (most of them are on the Biconomy side, with debug enabled):

Device Info (please complete the following information):

Device: Mac M1
OS: MacOS Monterey
Browser: chrome
Version 105
web3 1.7.3, @web3auth/web3auth 2.0.2, @biconomy/mexa 3.0.4

bcnmy / mexa-sdk