OPFaultGameFinder::gameAtIndex returns 5 arguments, but IOPFaultGameFinder::gameAtIndex only returns 4 arguments. The number of return argument variables mismatch between the interface used and the actual contract. Since the used return variables still match the order of the contract function. Runtime still behaves normally.
https://github.com/code-423n4/2024-12-unruggable/blob/9e0e908a207f088dd843fcdc3e4de5fa0edd6c5c/contracts/op/OPFaultVerifier.sol#L74
See in OPFaultGameFinder::gameAtIndex, 5 variables are returned.
https://github.com/code-423n4/2024-12-unruggable/blob/9e0e908a207f088dd843fcdc3e4de5fa0edd6c5c/contracts/op/OPFaultGameFinder.sol#L64
Revise IOPFaultGameFinder::gameAtIndex to return same arguments as OPFaultGameFinder and revise OPFaultVerifier::getStorageValues accordingly.
