diff --git a/e2e/e2etests/test_eth_withdraw.go b/e2e/e2etests/test_eth_withdraw.go
index 0ba15299e1..ebae83e2f2 100644
--- a/e2e/e2etests/test_eth_withdraw.go
+++ b/e2e/e2etests/test_eth_withdraw.go
@@ -39,8 +39,9 @@ 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")
 }
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
 }