BlockSubscribe no data output.

[kenneyLee]

I used BlockSubscribe, but found that there was no data output.But with the same endpoint, LogsSubscribe is running normally.
`package main

import (
"context"
"fmt"
"math"
"sync"

bin "github.com/gagliardetto/binary"
"github.com/gagliardetto/solana-go"
"github.com/gagliardetto/solana-go/programs/serum"
"github.com/gagliardetto/solana-go/rpc"

"github.com/gagliardetto/solana-go/programs/token"
"github.com/gagliardetto/solana-go/rpc/ws"

)

func main() {
client, err := ws.Connect(context.Background(), rpc.MainNetBeta_WS)

if err != nil {
	panic(err)
}

filter := ws.NewBlockSubscribeFilterAll()
opts := &ws.BlockSubscribeOpts{
	Commitment: rpc.CommitmentConfirmed,
}

sub, err := client.BlockSubscribe(filter, opts)
if err != nil {

	panic(err)
}
defer sub.Unsubscribe()

for {
	res, err := sub.Recv()
	if err != nil {
		fmt.Println("BlockSubscribe error:", err)
		panic(err)
	}

	fmt.Println("Received block:", res.Value.Block)

	for _, transaction := range res.Value.Block.Transactions {
		fmt.Println("Transaction:", transaction)
	}
}

}`

[gagliardetto]

https://solana.com/docs/rpc/websocket/blocksubscribe