Neither passkey nor an address goes through checks as implemented in MultiOwnable._initializeOwners() when added through addOwnerAddress() and addOwnerPublicKey() that have _addOwner() invoked,
https://github.com/code-423n4/2024-03-coinbase/blob/main/src/SmartWallet/MultiOwnable.sol#L179-L181
When CoinbaseSmartWallet._validateSignature() is called, a needed check is performed when ownerBytes.length == 32 but not so when ownerBytes.length == 64. Consider adding the needed check for a consistent earlier revert as follows:
https://github.com/code-423n4/2024-03-coinbase/blob/main/src/SmartWallet/CoinbaseSmartWallet.sol#L316-L324
