async function validateSPLTokenTransfer(
    message: Message,
    meta: ConfirmedTransactionMeta,
    recipient: Recipient,
    splToken: SPLToken
): Promise<[BigNumber, BigNumber]> {
    const recipientATA = await getAssociatedTokenAddress(splToken, recipient);
    const accountIndex = message.accountKeys.findIndex((pubkey) => pubkey.equals(recipientATA));
    if (accountIndex === -1) throw new ValidateTransferError('recipient not found');

    const preBalance = meta.preTokenBalances?.find((x) => x.accountIndex === accountIndex);
    const postBalance = meta.postTokenBalances?.find((x) => x.accountIndex === accountIndex);

    return [
        new BigNumber(preBalance?.uiTokenAmount.uiAmountString || 0),
        new BigNumber(postBalance?.uiTokenAmount.uiAmountString || 0),
    ];
}
The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.