diff --git a/tests/systemtests/fraud_test.go b/tests/systemtests/fraud_test.go
index a4c0b7875d8..2d2b8ae38cf 100644
--- a/tests/systemtests/fraud_test.go
+++ b/tests/systemtests/fraud_test.go
@@ -7,6 +7,7 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -43,8 +44,8 @@ func TestValidatorDoubleSign(t *testing.T) {
 
 	// let's wait some blocks to have evidence and update persisted
 	var nodePowerAfter int64 = -1
-	for i := 0; i < 30; i++ {
-		systest.Sut.AwaitNextBlock(t)
+	for i := 0; i < 100; i++ {
+		systest.Sut.AwaitNextBlock(t, 6*time.Second)
 		if nodePowerAfter = systest.QueryCometValidatorPower(rpc, pkBz); nodePowerAfter == 0 {
 			break
 		}
diff --git a/tests/systemtests/upgrade_test.go b/tests/systemtests/upgrade_test.go
index ae1e71903e9..81e2b93f5d6 100644
--- a/tests/systemtests/upgrade_test.go
+++ b/tests/systemtests/upgrade_test.go
@@ -40,7 +40,7 @@ func TestChainUpgrade(t *testing.T) {
 		upgradeName         = "v052-to-v054" // must match UpgradeName in simapp/upgrades.go
 	)
 
-	systest.Sut.StartChain(t, fmt.Sprintf("--halt-height=%d", upgradeHeight+1))
+	systest.Sut.StartChain(t, fmt.Sprintf("--comet.halt-height=%d", upgradeHeight+1))
 
 	cli := systest.NewCLIWrapper(t, systest.Sut, systest.Verbose)
 	govAddr := sdk.AccAddress(address.Module("gov")).String()
diff --git a/x/auth/tx/config.go b/x/auth/tx/config.go
index 9b10f645a62..42a0760d978 100644
--- a/x/auth/tx/config.go
+++ b/x/auth/tx/config.go
@@ -189,16 +189,15 @@ func NewTxConfigWithOptions(protoCodec codec.Codec, configOptions ConfigOptions)
 		}
 	}
 
+	txConfig.txDecoder, err = txdecode.NewDecoder(txdecode.Options{
+		SigningContext: configOptions.SigningContext,
+		ProtoCodec:     protoCodec,
+	})
+	if err != nil {
+		return nil, err
+	}
 	if configOptions.ProtoDecoder == nil {
-		dec, err := txdecode.NewDecoder(txdecode.Options{
-			SigningContext: configOptions.SigningContext,
-			ProtoCodec:     protoCodec,
-		})
-		if err != nil {
-			return nil, err
-		}
-		txConfig.decoder = txV2toInterface(configOptions.SigningOptions.AddressCodec, protoCodec, dec)
-		txConfig.txDecoder = dec
+		txConfig.decoder = DefaultTxDecoder(configOptions.SigningOptions.AddressCodec, protoCodec, txConfig.txDecoder)
 	}
 	if configOptions.ProtoEncoder == nil {
 		txConfig.encoder = DefaultTxEncoder()
@@ -262,13 +261,3 @@ func (g config) TxJSONDecoder() sdk.TxDecoder {
 func (g config) SigningContext() *txsigning.Context {
 	return g.signingContext
 }
-
-func txV2toInterface(addrCodec address.Codec, cdc codec.BinaryCodec, decoder *txdecode.Decoder) func([]byte) (sdk.Tx, error) {
-	return func(txBytes []byte) (sdk.Tx, error) {
-		decodedTx, err := decoder.Decode(txBytes)
-		if err != nil {
-			return nil, err
-		}
-		return newWrapperFromDecodedTx(addrCodec, cdc, decodedTx)
-	}
-}
diff --git a/x/auth/tx/decoder.go b/x/auth/tx/decoder.go
index 74b20621690..93474a6bb5b 100644
--- a/x/auth/tx/decoder.go
+++ b/x/auth/tx/decoder.go
@@ -14,6 +14,17 @@ import (
 	"github.com/cosmos/cosmos-sdk/types/tx"
 )
 
+// DefaultTxDecoder returns a default protobuf TxDecoder.
+func DefaultTxDecoder(addrCodec address.Codec, cdc codec.BinaryCodec, decoder *decode.Decoder) func([]byte) (sdk.Tx, error) {
+	return func(txBytes []byte) (sdk.Tx, error) {
+		decodedTx, err := decoder.Decode(txBytes)
+		if err != nil {
+			return nil, err
+		}
+		return newWrapperFromDecodedTx(addrCodec, cdc, decodedTx)
+	}
+}
+
 // DefaultJSONTxDecoder returns a default protobuf JSON TxDecoder using the provided Marshaler.
 func DefaultJSONTxDecoder(addrCodec address.Codec, cdc codec.Codec, decoder *decode.Decoder) sdk.TxDecoder {
 	return func(txBytes []byte) (sdk.Tx, error) {