cleanup + fix tx processing issue

app/preblocker.go

@@ -47,28 +47,26 @@ func (app *App) PreBlocker(ctx sdk.Context, req *cometabci.RequestFinalizeBlock)
 	}
 	voteExtensionsEnabled := abci.VoteExtensionsEnabled(ctx)
 	if voteExtensionsEnabled {
-		for _, tx := range req.Txs {
-			var injectedVoteExtTx types.InjectedVoteExtensionTx
-			if err := injectedVoteExtTx.Unmarshal(tx); err != nil {
-				app.Logger().Error("failed to decode injected vote extension tx", "err", err)
-				return nil, err
-			}
-			for _, exchangeRateVote := range injectedVoteExtTx.ExchangeRateVotes {
-				valAddr, err := sdk.ValAddressFromBech32(exchangeRateVote.Voter)
-				if err != nil {
-					app.Logger().Error("failed to get voter address", "err", err)
-					continue
-				}
-				app.OracleKeeper.SetAggregateExchangeRateVote(ctx, valAddr, exchangeRateVote)
-			}
-			for _, gasEstimate := range injectedVoteExtTx.GasEstimateMedians {
-				app.GasEstimateKeeper.SetGasEstimate(ctx, gasestimatetypes.GasEstimate{
-					Network:     gasEstimate.Network,
-					GasEstimate: gasEstimate.GasEstimation,
-				})
+		var injectedVoteExtTx types.InjectedVoteExtensionTx
+		if err := injectedVoteExtTx.Unmarshal(req.Txs[0]); err != nil {
+			app.Logger().Error("failed to decode injected vote extension tx", "err", err)
+			return nil, err
+		}
+		for _, exchangeRateVote := range injectedVoteExtTx.ExchangeRateVotes {
+			valAddr, err := sdk.ValAddressFromBech32(exchangeRateVote.Voter)
+			if err != nil {
+				app.Logger().Error("failed to get voter address", "err", err)
+				continue
 			}
-			app.Logger().Info("gas estimates updated", "gasestimates", injectedVoteExtTx.GasEstimateMedians)
+			app.OracleKeeper.SetAggregateExchangeRateVote(ctx, valAddr, exchangeRateVote)
+		}
+		for _, gasEstimate := range injectedVoteExtTx.GasEstimateMedians {
+			app.GasEstimateKeeper.SetGasEstimate(ctx, gasestimatetypes.GasEstimate{
+				Network:     gasEstimate.Network,
+				GasEstimate: gasEstimate.GasEstimation,
+			})
 		}
+		app.Logger().Info("gas estimates updated", "gasestimates", injectedVoteExtTx.GasEstimateMedians)
 	}
 
 	app.Logger().Info(