diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 3b3fd0770..e751ca666 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -2091,6 +2091,14 @@ func (bc *Blockchain) GetContractState(hash util.Uint160) *state.Contract {
 
 // GetContractScriptHash returns contract script hash by its ID.
 func (bc *Blockchain) GetContractScriptHash(id int32) (util.Uint160, error) {
+	if id < 0 {
+		for _, n := range bc.contracts.Contracts {
+			nc := n.Metadata().NativeContract
+			if nc.ID == id {
+				return nc.Hash, nil
+			}
+		}
+	}
 	return native.GetContractScriptHash(bc.dao, id)
 }
 
diff --git a/pkg/core/native/management.go b/pkg/core/native/management.go
index 2b26ad36f..c56159398 100644
--- a/pkg/core/native/management.go
+++ b/pkg/core/native/management.go
@@ -688,8 +688,10 @@ func putContractState(d *dao.Simple, cs *state.Contract, updateCache bool) error
 	if cs.UpdateCounter != 0 { // Update.
 		return nil
 	}
-	key = putHashKey(key, cs.ID)
-	d.PutStorageItem(ManagementContractID, key, cs.Hash.BytesBE())
+	if cs.ID > 0 {
+		key = putHashKey(key, cs.ID)
+		d.PutStorageItem(ManagementContractID, key, cs.Hash.BytesBE())
+	}
 	return nil
 }
 
diff --git a/pkg/core/native/native_test/management_test.go b/pkg/core/native/native_test/management_test.go
index 22b8669d6..dd5535cdb 100644
--- a/pkg/core/native/native_test/management_test.go
+++ b/pkg/core/native/native_test/management_test.go
@@ -566,6 +566,7 @@ func TestManagement_GetContract(t *testing.T) {
 	t.Run("by ID, positive", func(t *testing.T) {
 		managementInvoker.Invoke(t, si, "getContractById", cs1.ID)
 	})
+	/* C# compatibility
 	t.Run("by ID, native", func(t *testing.T) {
 		csm := managementInvoker.Executor.Chain.GetContractState(managementInvoker.Hash)
 		require.NotNil(t, csm)
@@ -573,6 +574,7 @@ func TestManagement_GetContract(t *testing.T) {
 		require.NoError(t, err)
 		managementInvoker.Invoke(t, sim, "getContractById", -1)
 	})
+	*/
 	t.Run("by ID, empty", func(t *testing.T) {
 		managementInvoker.Invoke(t, stackitem.Null{}, "getContractById", -100)
 	})
diff --git a/pkg/services/rpcsrv/client_test.go b/pkg/services/rpcsrv/client_test.go
index e80eacc2c..c36b2023f 100644
--- a/pkg/services/rpcsrv/client_test.go
+++ b/pkg/services/rpcsrv/client_test.go
@@ -256,10 +256,11 @@ func TestClientManagementContract(t *testing.T) {
 	cs2, err := c.GetContractStateByHash(gas.Hash)
 	require.NoError(t, err)
 	require.Equal(t, cs2, cs1)
+	/* C# compat
 	cs1, err = manReader.GetContractByID(-6)
 	require.NoError(t, err)
 	require.Equal(t, cs2, cs1)
-
+	*/
 	ret, err := manReader.HasMethod(gas.Hash, "transfer", 4)
 	require.NoError(t, err)
 	require.True(t, ret)
diff --git a/pkg/services/rpcsrv/server_test.go b/pkg/services/rpcsrv/server_test.go
index 19b22b244..a6851a841 100644
--- a/pkg/services/rpcsrv/server_test.go
+++ b/pkg/services/rpcsrv/server_test.go
@@ -82,7 +82,7 @@ const (
 	faultedTxHashLE                   = "82279bfe9bada282ca0f8cb8e0bb124b921af36f00c69a518320322c6f4fef60"
 	faultedTxBlock             uint32 = 23
 	invokescriptContractAVM           = "VwIADBQBDAMOBQYMDQIODw0DDgcJAAAAAErZMCQE2zBwaEH4J+yMqiYEEUAMFA0PAwIJAAIBAwcDBAUCAQAOBgwJStkwJATbMHFpQfgn7IyqJgQSQBNA"
-	block20StateRootLE                = "13620fef0fb28060523a0b73ce574ee4658fca5d0d24078a73e74a349c37a854"
+	block20StateRootLE                = "811a287a0235cfb3c7def100ae7029335a10e8b90d0ca59c460955c0546a0414"
 )
 
 var (