diff --git a/e2e/e2etests/test_eth_withdraw.go b/e2e/e2etests/test_eth_withdraw.go
index 0ba15299e1..22686141a9 100644
--- a/e2e/e2etests/test_eth_withdraw.go
+++ b/e2e/e2etests/test_eth_withdraw.go
@@ -39,12 +39,14 @@ func TestEtherWithdraw(r *runner.E2ERunner, args []string) {
 
 	utils.RequireCCTXStatus(r, cctx, crosschaintypes.CctxStatus_OutboundMined)
 
-	withdrawalReceipt := mustFetchEthReceipt(r, cctx)
-	require.Equal(r, uint8(ethtypes.DynamicFeeTxType), withdrawalReceipt.Type, "receipt type mismatch")
+	//Skipped due to https://github.com/zeta-chain/node/issues/3221
+	//withdrawalReceipt := mustFetchEthReceipt(r, cctx)
+	//require.Equal(r, uint8(ethtypes.DynamicFeeTxType), withdrawalReceipt.Type, "receipt type mismatch")
 
 	r.Logger.Info("TestEtherWithdraw completed")
 }
 
+// nolint:unused // https://github.com/zeta-chain/node/issues/3221
 func mustFetchEthReceipt(r *runner.E2ERunner, cctx *crosschaintypes.CrossChainTx) *ethtypes.Receipt {
 	hash := cctx.GetCurrentOutboundParam().Hash
 	require.NotEmpty(r, hash, "outbound hash is empty")
diff --git a/zetaclient/chains/evm/observer/observer.go b/zetaclient/chains/evm/observer/observer.go
index 8823b13c47..eb866da253 100644
--- a/zetaclient/chains/evm/observer/observer.go
+++ b/zetaclient/chains/evm/observer/observer.go
@@ -53,7 +53,11 @@ type Observer struct {
 
 // priorityFeeConfig is the configuration for priority fee
 type priorityFeeConfig struct {
-	checked   bool
+	// checked indicates whether the observer checked
+	// this EVM chain for EIP-1559 (further checks are cached)
+	checked bool
+
+	// supported indicates whether this EVM chain supports EIP-1559
 	supported bool
 }
 
diff --git a/zetaclient/chains/evm/signer/gas.go b/zetaclient/chains/evm/signer/gas.go
index 6727758edd..586863a009 100644
--- a/zetaclient/chains/evm/signer/gas.go
+++ b/zetaclient/chains/evm/signer/gas.go
@@ -57,6 +57,8 @@ func (g Gas) validate() error {
 // or DynamicFeeTx{} (post EIP-1559).
 //
 // Returns true if priority fee is <= 0.
+//
+//nolint:unused // https://github.com/zeta-chain/node/issues/3221
 func (g Gas) isLegacy() bool {
 	return g.PriorityFee.Sign() < 1
 }
diff --git a/zetaclient/chains/evm/signer/sign_test.go b/zetaclient/chains/evm/signer/sign_test.go
index c3d64ebabc..bad6c99354 100644
--- a/zetaclient/chains/evm/signer/sign_test.go
+++ b/zetaclient/chains/evm/signer/sign_test.go
@@ -60,6 +60,7 @@ func TestSigner_SignConnectorOnReceive(t *testing.T) {
 	})
 
 	t.Run("SignOutbound - should successfully sign DynamicFeeTx", func(t *testing.T) {
+		t.Skip("Skipped due to https://github.com/zeta-chain/node/issues/3221")
 		// ARRANGE
 		const (
 			gwei        = 1_000_000_000
diff --git a/zetaclient/chains/evm/signer/signer.go b/zetaclient/chains/evm/signer/signer.go
index 5cebb323c1..fc471ad7c9 100644
--- a/zetaclient/chains/evm/signer/signer.go
+++ b/zetaclient/chains/evm/signer/signer.go
@@ -219,7 +219,7 @@ func (signer *Signer) Sign(
 }
 
 func newTx(
-	chainID *big.Int,
+	_ *big.Int,
 	data []byte,
 	to ethcommon.Address,
 	amount *big.Int,
@@ -230,27 +230,28 @@ func newTx(
 		return nil, errors.Wrap(err, "invalid gas parameters")
 	}
 
-	if gas.isLegacy() {
-		return ethtypes.NewTx(&ethtypes.LegacyTx{
-			To:       &to,
-			Value:    amount,
-			Data:     data,
-			GasPrice: gas.Price,
-			Gas:      gas.Limit,
-			Nonce:    nonce,
-		}), nil
-	}
-
-	return ethtypes.NewTx(&ethtypes.DynamicFeeTx{
-		ChainID:   chainID,
-		To:        &to,
-		Value:     amount,
-		Data:      data,
-		GasFeeCap: gas.Price,
-		GasTipCap: gas.PriorityFee,
-		Gas:       gas.Limit,
-		Nonce:     nonce,
+	// https://github.com/zeta-chain/node/issues/3221
+	//if gas.isLegacy() {
+	return ethtypes.NewTx(&ethtypes.LegacyTx{
+		To:       &to,
+		Value:    amount,
+		Data:     data,
+		GasPrice: gas.Price,
+		Gas:      gas.Limit,
+		Nonce:    nonce,
 	}), nil
+	//}
+	//
+	//return ethtypes.NewTx(&ethtypes.DynamicFeeTx{
+	//	ChainID:   chainID,
+	//	To:        &to,
+	//	Value:     amount,
+	//	Data:      data,
+	//	GasFeeCap: gas.Price,
+	//	GasTipCap: gas.PriorityFee,
+	//	Gas:       gas.Limit,
+	//	Nonce:     nonce,
+	//}), nil
 }
 
 func (signer *Signer) broadcast(ctx context.Context, tx *ethtypes.Transaction) error {