Appended calldate gets lost

[AndyOooh]

Hi,

I am trying to append an identifier to calls to a SC.
This works for EAOs but with CB smart wallet the appended hex gets lost somehow.

If I understand correctly, the flow is this:
Frontend(batched ERC20 approve and our SC function call with appended Hex) --> bundler --> entry point --> our SC.

I have decoded calldata on every step but don't see the the appended data. I would expect to see it on the calldata to the 'target' SC as I do when using EOA.
The tx is successful, just without the appended data.

On the frontend I do something like:

// Using Viem and wagmi:

const contractCalls = () => {
  const paymentContractParams = {
    chainId,
    address: routerAddress,
    abi: routerAbi,
    functionName,
    args,
    value,
    dataSuffix: payload.dataSuffix || '0x',
  };

  const approveContractParams = {
    address: tokenAddress,
    abi: tokenAbi,
    functionName: 'approve',
    args: [routerAddress, tokenValue],
  };
  return [paymentContractParams, approveContractParams];
};

const { writeContractsAsync } = useWriteContracts();

const result = await writeContractsAsync?.({
  contracts: contractCalls,
  capabilities,
});

Could it be that the bundler or entry point strips away the appended data?

Has this been tested before?

This tx (SCA) on Base chain:
https://basescan.org/tx/0xa296390756c2fe38575b0d0d321a71d32931ae164eb2ced79c3225e590cdee84
Should have 1dc0de004d appended to the yodlWithAcross call.

Just like this one (EOA) has:
https://basescan.org/tx/0x8a86dfc90044f5b9ea7c91d540ff04716341e7c7296101eb4f063c1012d9d5ad