passes tests now!

internal/vault/metadata.go

@@ -75,8 +75,8 @@ func GetNextDerivationIndex(fs afero.Fs, stateDir string, mnemonic string) (uint
 			continue
 		}
 
-		// Check if this vault uses the same mnemonic by comparing public key hashes
-		if metadata.PublicKeyHash == pubKeyHash {
+		// Check if this vault uses the same mnemonic by comparing family hashes
+		if metadata.MnemonicFamilyHash == pubKeyHash {
 			usedIndices[metadata.DerivationIndex] = true
 		}
 	}