fix(codec): MarshalInterface should err when UnmarshalInterface will fail (#12964)

## Description

Closes: #12894 



---

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- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
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- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/building-modules)
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- [ ] added a changelog entry to `CHANGELOG.md`
- [x] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [x] updated the relevant documentation or specification
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- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
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- [ ] manually tested (if applicable)

codec/proto_codec_test.go

@@ -3,6 +3,7 @@ package codec_test
 import (
 	"errors"
 	"fmt"
+	"reflect"
 	"testing"
 
 	"github.com/gogo/protobuf/proto"
@@ -46,6 +47,70 @@ func (lpm *lyingProtoMarshaler) Size() int {
 	return lpm.falseSize
 }
 
+func TestEnsureRegistered(t *testing.T) {
+	interfaceRegistry := types.NewInterfaceRegistry()
+	cat := &testdata.Cat{Moniker: "Garfield"}
+
+	err := interfaceRegistry.EnsureRegistered(*cat)
+	require.ErrorContains(t, err, "testdata.Cat is not a pointer")
+
+	err = interfaceRegistry.EnsureRegistered(cat)
+	require.ErrorContains(t, err, "testdata.Cat does not have a registered interface")
+
+	interfaceRegistry.RegisterInterface("testdata.Animal",
+		(*testdata.Animal)(nil),
+		&testdata.Cat{},
+	)
+
+	require.NoError(t, interfaceRegistry.EnsureRegistered(cat))
+}
+
+func TestProtoCodecMarshal(t *testing.T) {
+	interfaceRegistry := types.NewInterfaceRegistry()
+	interfaceRegistry.RegisterInterface("testdata.Animal",
+		(*testdata.Animal)(nil),
+		&testdata.Cat{},
+	)
+	cdc := codec.NewProtoCodec(interfaceRegistry)
+
+	cartonRegistry := types.NewInterfaceRegistry()
+	cartonRegistry.RegisterInterface("testdata.Cartoon",
+		(*testdata.Cartoon)(nil),
+		&testdata.Bird{},
+	)
+	cartoonCdc := codec.NewProtoCodec(cartonRegistry)
+
+	cat := &testdata.Cat{Moniker: "Garfield", Lives: 6}
+	bird := &testdata.Bird{Species: "Passerina ciris"}
+	require.NoError(t, interfaceRegistry.EnsureRegistered(cat))
+
+	var (
+		animal  testdata.Animal
+		cartoon testdata.Cartoon
+	)
+
+	// sanity check
+	require.True(t, reflect.TypeOf(cat).Implements(reflect.TypeOf((*testdata.Animal)(nil)).Elem()))
+
+	bz, err := cdc.MarshalInterface(cat)
+	require.NoError(t, err)
+
+	err = cdc.UnmarshalInterface(bz, &animal)
+	require.NoError(t, err)
+
+	bz, err = cdc.MarshalInterface(bird)
+	require.ErrorContains(t, err, "does not have a registered interface")
+
+	bz, err = cartoonCdc.MarshalInterface(bird)
+	require.NoError(t, err)
+
+	err = cdc.UnmarshalInterface(bz, &cartoon)
+	require.ErrorContains(t, err, "no registered implementations")
+
+	err = cartoonCdc.UnmarshalInterface(bz, &cartoon)
+	require.NoError(t, err)
+}
+
 func TestProtoCodecUnmarshalLengthPrefixedChecks(t *testing.T) {
 	cdc := codec.NewProtoCodec(createTestInterfaceRegistry())