Error in handling Token Transfers with nearly identical amount and Relayer fee in Wormhole SDK

[ilariae]

We are encountering a precision error in the Wormhole SDK when executing TokenTransfer.from. The issue arises for USDC transactions where the token transfer amount is nearly identical to the relayer fee.

The function that was failing:

export async function getWhTokenTransferByTxID() {
  const txId = '0xd26c5b36d1125f031f44eee7a98989aae10e9df39809d5124a1dc6f43bfbf1ce';
  const wh = new Wormhole('Mainnet', [EvmPlatform]);

  try {
    const vaa = await TokenTransfer.getTransferVaa(wh, txId);
    if (!vaa) {
      throw new Error(`VAA not found for txId ${txId}`);
    }
    const tokenTransfer = await TokenTransfer.from(wh, {
      chain: vaa.emitterChain,
      txid: txId,
    }); // THIS IS FALING
  } catch (e) {
    console.error(e);
    throw new Error((e as Error).message);
  }
}

The error happens during the execution of TokenTransfer.from
Error message:

scaleAmount({"amount":"1423266","decimals":8}, 6) would result in altered amount. Use truncateAmount first if you intended to truncate it. 

After inspection of the VAA we saw the token amount (1423266) and the relayer fee (1423265) are almost identical, this could be causing a precision or scaling issue within the SDK

After increasing the amount sent the transaction went through: https://wormholescan.io/#/tx/0xe82f5a9aaf54935dd74ae9e6a29554ebeec0cbbb3adebc79753dd4f395c48345?network=Mainnet