Optimism does not return Layer 1 gas fees. The same for Base.
Please see - https://optimistic.etherscan.io/tx/0x11dc45451984e73a28ab3f1fb053ed773436e1a69e96ae53cb3f981a2496628e
There is a layer 1 fee of 0.000000041799532644 which is not added
@Riccardom any updates on this?