Root

The return value of i_weth.transfer() were not used, which will not detect WETH transfer failure. Downgraded the issue severity to low, since it is unlikely to result in catastrophic loss of funds. (collectFee is guarded by onlyCollector() modifier).

Impact

The impact is almost minimal to non-existent, since a failed WETH transfer would not update both the sender and recipient balances. Although, this can slightly cause a minor inconvenience in debugging, when users were trying to figure out why the transfer had failed.

Mitigation