The contract demonstrates inconsistent usage between tokenIn and weth variables, which could lead to confusion and potential issues:

1. While the contract documentation indicates WETH is used as the input token, the contract maintains separate declarations for tokenIn and weth.

/**
* @notice The wETH token is utilized as the input token, which is later unwrapped to ETH and re-wrapped to
* facilitate Dinero investments.
*/
address public override tokenIn;

/**
* @notice wETH address used for strategy
*/
IWETH9 public weth;

2. The deposit() function validates _asset against tokenIn, but then uses the weth address for withdrawals:

function deposit(
    address _asset,
    uint256 _amount,
    address _recipient,
    bytes calldata
) external override nonReentrant onlyValidAmount(_amount) onlyStrategyManager returns (uint256, uint256) {
    require(_asset == tokenIn, "3001");
    uint256 balanceBefore = IERC20(tokenOut).balanceOf(_recipient);

    IHolding(_recipient).transfer({ _token: _asset, _to: address(this), _amount: _amount });

    // Swap wETH to ETH.
    weth.withdraw(_amount);
    // Deposit ETH to mint pxETH and stakes pxETH for autocompounding.
    pirexEth.deposit{ value: _amount }({ receiver: _recipient, shouldCompound: true });

    uint256 shares = IERC20(tokenOut).balanceOf(_recipient) - balanceBefore;
    recipients[_recipient].investedAmount += _amount;
    recipients[_recipient].totalShares += shares;

    // Mint Strategy's receipt tokens to allow later withdrawal.
    _mint({
        _receiptToken: receiptToken,
        _recipient: _recipient,
        _amount: shares,
        _tokenDecimals: IERC20Metadata(tokenOut).decimals()
    });

    // Register `_recipient`'s deposit operation to generate jigsaw rewards.
    jigsawStaker.deposit({ _user: _recipient, _amount: shares });

    emit Deposit({
        asset: _asset,
        tokenIn: tokenIn,
        assetAmount: _amount,
        tokenInAmount: _amount,
        shares: shares,
        recipient: _recipient
    });
    return (shares, _amount);
}

3. The withdraw() function shows similar inconsistency by using tokenIn for transfers and balance checks, while also referencing weth:

function withdraw(
    uint256 _shares,
    address _recipient,
    address _asset,
    bytes calldata
) external override nonReentrant onlyStrategyManager returns (uint256, uint256) {
    require(_asset == tokenIn, "3001");
    require(_shares <= IERC20(tokenOut).balanceOf(_recipient), "2002");

    WithdrawParams memory params = WithdrawParams({
        shareRatio: 0,
        investment: 0,
        balanceBefore: 0,
        balanceAfter: 0,
        balanceDiff: 0,
        performanceFee: 0
    });

    // Calculate the ratio between all user's shares and the amount of shares used for withdrawal.
    params.shareRatio = OperationsLib.getRatio({
        numerator: _shares,
        denominator: recipients[_recipient].totalShares,
        precision: IERC20Metadata(tokenOut).decimals(),
        rounding: OperationsLib.Rounding.Floor
    });

    // Burn Strategy's receipt tokens used for withdrawal.
    _burn({
        _receiptToken: receiptToken,
        _recipient: _recipient,
        _shares: _shares,
        _totalShares: recipients[_recipient].totalShares,
        _tokenDecimals: IERC20Metadata(tokenOut).decimals()
    });

    // To accurately compute the protocol's fees from the yield generated by the strategy, we first need to
    // determine the percentage of the initial investment being withdrawn. This allows us to assess whether any
    // yield has been generated beyond the initial investment.
    params.investment =
        (recipients[_recipient].investedAmount * params.shareRatio) / (10 ** IERC20Metadata(tokenOut).decimals());

    params.balanceBefore = IERC20(tokenIn).balanceOf(_recipient);

    // Redeem pxETH via the AutoPirexEth contract using the recipient's `IHolding` contract.
    (bool success, bytes memory returnData) = IHolding(_recipient).genericCall({
        _contract: address(autoPirexEth),
        _call: abi.encodeCall(IAutoPxEth.redeem, (_shares, address(this), _recipient))
    });

    // Ensure the external call was successful and decode any potential revert reason.
    require(success, OperationsLib.getRevertMsg(returnData));

    // Decode the returned data to get the amount of pxETH withdrawn from the AutoPirexEth contract.
    uint256 pxEthWithdrawn = abi.decode(returnData, (uint256));

    // Use the PirexEth contract to instantly redeem the withdrawn pxETH for ETH.
    (uint256 postFeeAmount,) = pirexEth.instantRedeemWithPxEth(pxEthWithdrawn, address(this));

    // Swap ETH back to WETH.
    weth.deposit{ value: postFeeAmount }();

    // Transfer WETH to the `_recipient`.
    IERC20(tokenIn).safeTransfer(_recipient, postFeeAmount);

    // Take protocol's fee if any.
    params.balanceDiff = IERC20(tokenIn).balanceOf(_recipient) - params.balanceBefore;
    (params.performanceFee,,) = _getStrategyManager().strategyInfo(address(this));
    if (params.balanceDiff > params.investment && params.performanceFee != 0) {
        uint256 rewardAmount = params.balanceDiff - params.investment;
        uint256 fee = OperationsLib.getFeeAbsolute(rewardAmount, params.performanceFee);
        if (fee > 0) {
            address feeAddr = _getManager().feeAddress();
            emit FeeTaken(tokenIn, feeAddr, fee);
            IHolding(_recipient).transfer(tokenIn, feeAddr, fee);
        }
    }

    recipients[_recipient].totalShares -= _shares;
    recipients[_recipient].investedAmount = params.investment > recipients[_recipient].investedAmount
        ? 0
        : recipients[_recipient].investedAmount - params.investment;

    emit Withdraw({ asset: _asset, recipient: _recipient, shares: _shares, amount: params.balanceDiff });
    // Register `_recipient`'s withdrawal operation to stop generating jigsaw rewards.
    jigsawStaker.withdraw({ _user: _recipient, _amount: _shares });

    return (params.balanceDiff, params.investment);
}

This inconsistency could lead to the disruption of the strategies in case the tokens are not aligned correctly. Additionally it introduces unnecessary complexity and potential for future errors.

Consider removing either tokenIn or weth and use a single reference consistently throughout the contract. Alternatively, ensure that tokenIn is always equal to weth. Add explicit documentation to clarify the token usage.

SOLVED: The Jigsaw Protocol team solved this finding in commit 3b62613 by following the mentioned recommendation.