fix(coinbase): clear AutoStakeDestination on subnet dissolve

pallets/subtensor/src/coinbase/root.rs

@@ -475,6 +475,28 @@ impl<T: Config> Pallet<T> {
                 StakingOperationRateLimiter::<T>::remove((hot, cold, netuid));
             }
         }
+        // AutoStakeDestination: (cold, netuid) → hot. Without this cleanup, a
+        // stale destination from a dissolved subnet would silently redirect
+        // mining incentive when the same netuid is later re-registered (see
+        // `run_coinbase` auto-stake path).
+        {
+            let to_rm: sp_std::vec::Vec<T::AccountId> = AutoStakeDestination::<T>::iter()
+                .filter_map(|(cold, n, _)| if n == netuid { Some(cold) } else { None })
+                .collect();
+            for cold in to_rm {
+                AutoStakeDestination::<T>::remove(&cold, netuid);
+            }
+        }
+        // AutoStakeDestinationColdkeys: (hot, netuid) → Vec<cold>. Companion
+        // reverse-index to AutoStakeDestination; must be cleared in lockstep.
+        {
+            let to_rm: sp_std::vec::Vec<T::AccountId> = AutoStakeDestinationColdkeys::<T>::iter()
+                .filter_map(|(hot, n, _)| if n == netuid { Some(hot) } else { None })
+                .collect();
+            for hot in to_rm {
+                AutoStakeDestinationColdkeys::<T>::remove(&hot, netuid);
+            }
+        }
 
         // --- 22. Subnet leasing: remove mapping and any lease-scoped state linked to this netuid.
         if let Some(lease_id) = SubnetUidToLeaseId::<T>::take(netuid) {

pallets/subtensor/src/tests/networks.rs

@@ -461,6 +461,10 @@ fn dissolve_clears_all_per_subnet_storages() {
         // EVM association indexed by (netuid, uid)
         AssociatedEvmAddress::<Test>::insert(net, 0u16, (sp_core::H160::zero(), 1u64));
 
+        // Auto-stake destination (cold,netuid) -> hot + reverse index
+        AutoStakeDestination::<Test>::insert(owner_cold, net, owner_hot);
+        AutoStakeDestinationColdkeys::<Test>::mutate(owner_hot, net, |v| v.push(owner_cold));
+
         // (Optional) subnet -> lease link
         SubnetUidToLeaseId::<Test>::insert(net, 42u32);
 
@@ -626,13 +630,52 @@ fn dissolve_clears_all_per_subnet_storages() {
         // Subnet -> lease link
         assert!(!SubnetUidToLeaseId::<Test>::contains_key(net));
 
+        // Auto-stake destination + reverse index cleared
+        assert!(AutoStakeDestination::<Test>::get(owner_cold, net).is_none());
+        assert!(AutoStakeDestinationColdkeys::<Test>::get(owner_hot, net).is_empty());
+
         // ------------------------------------------------------------------
         // Final subnet removal confirmation
         // ------------------------------------------------------------------
         assert!(!SubtensorModule::if_subnet_exist(net));
     });
 }
 
+// Focused regression for the AutoStakeDestination orphan: without cleanup on
+// dissolve, a stale (coldkey, netuid) → hotkey mapping would survive the
+// subnet's dissolution and silently redirect mining incentive when the same
+// netuid is later re-registered (see `coinbase::run_coinbase` auto-stake
+// path). This test proves the cleanup wipes both halves of the index.
+#[test]
+fn dissolve_clears_auto_stake_destination_preventing_stale_routing() {
+    new_test_ext(0).execute_with(|| {
+        let owner_cold = U256::from(101);
+        let owner_hot = U256::from(102);
+        let net = add_dynamic_network(&owner_hot, &owner_cold);
+
+        let staker_cold = U256::from(201);
+        let stale_dest_hot = U256::from(202);
+
+        AutoStakeDestination::<Test>::insert(staker_cold, net, stale_dest_hot);
+        AutoStakeDestinationColdkeys::<Test>::mutate(stale_dest_hot, net, |v| v.push(staker_cold));
+
+        // Sanity: both halves of the index are populated before dissolve.
+        assert_eq!(
+            AutoStakeDestination::<Test>::get(staker_cold, net),
+            Some(stale_dest_hot)
+        );
+        assert_eq!(
+            AutoStakeDestinationColdkeys::<Test>::get(stale_dest_hot, net),
+            vec![staker_cold]
+        );
+
+        assert_ok!(SubtensorModule::do_dissolve_network(net));
+
+        assert!(AutoStakeDestination::<Test>::get(staker_cold, net).is_none());
+        assert!(AutoStakeDestinationColdkeys::<Test>::get(stale_dest_hot, net).is_empty());
+    });
+}
+
 #[test]
 fn dissolve_alpha_out_but_zero_tao_no_rewards() {
     new_test_ext(0).execute_with(|| {

runtime/src/lib.rs

@@ -272,7 +272,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
     //   `spec_version`, and `authoring_version` are the same between Wasm and native.
     // This value is set to 100 to notify Polkadot-JS App (https://polkadot.js.org/apps) to use
     //   the compatible custom types.
-    spec_version: 406,
+    spec_version: 407,
     impl_version: 1,
     apis: RUNTIME_API_VERSIONS,
     transaction_version: 1,