wallet: Always write last hardened cache flag in migrated wallets

src/wallet/wallet.cpp

@@ -3851,7 +3851,7 @@ util::Result<void> CWallet::ApplyMigrationData(WalletBatch& local_wallet_batch,
     m_internal_spk_managers.clear();
 
     // Setup new descriptors (only if we are migrating any key material)
-    SetWalletFlagWithDB(local_wallet_batch, WALLET_FLAG_DESCRIPTORS);
+    SetWalletFlagWithDB(local_wallet_batch, WALLET_FLAG_DESCRIPTORS | WALLET_FLAG_LAST_HARDENED_XPUB_CACHED);
     if (has_spendable_material && !IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
         // Use the existing master key if we have it
         if (data.master_key.key.IsValid()) {