core: return locally stored chain config if exists

Author: rjl493456442

core/genesis.go

@@ -432,12 +432,14 @@ func LoadChainConfig(db ethdb.Database, genesis *Genesis) (cfg *params.ChainConf
 }
 
 // chainConfigOrDefault retrieves the attached chain configuration. If the genesis
-// object is null, it returns the default chain configuration based on the given
-// genesis hash, or the locally stored config if it's not a pre-defined network.
+// object is nil, it returns the locally stored configuration if available;
+// otherwise, it returns the default configuration for the predefined testnets.
 func (g *Genesis) chainConfigOrDefault(ghash common.Hash, stored *params.ChainConfig) *params.ChainConfig {
 	switch {
 	case g != nil:
 		return g.Config
+	case stored != nil:
+		return stored
 	case ghash == params.MainnetGenesisHash:
 		return params.MainnetChainConfig
 	case ghash == params.HoleskyGenesisHash:
@@ -446,9 +448,8 @@ func (g *Genesis) chainConfigOrDefault(ghash common.Hash, stored *params.ChainCo
 		return params.SepoliaChainConfig
 	case ghash == params.HoodiGenesisHash:
 		return params.HoodiChainConfig
-	default:
-		return stored
 	}
+	return nil
 }
 
 // IsVerkle indicates whether the state is already stored in a verkle