Summary

Approval of unwrappedDepositToken on L1Sender.sol contract is miswritten probably due to an oversight since everywhere else in the codebase Safe library is used for safeTransfer, safeTransferFrom and safeApprove.

Tools Used

Manual review

Recommendations

use safeApprove instead of approve or check return value of approve.

This is given a low severity since its probably an oversight in writing code.