When I use get_balance(), the balance obtained is 0, but it is not actually 0

[kkthmyh]

I checked the api document and followed the sample code inside to get the BTC balance of my wallet, but it was displayed as 0. In fact, the balance was not 0. My code is as follows. Did I go wrong?

let client = Client::new("ssl://electrum.blockstream.info:60002").unwrap();
    let blockchain = ElectrumBlockchain::from(client);
    let wallet = Wallet::new(
        "tr([3ba8a558/86'/0'/0']*****)#g0sk9ytj",
        Some("tr(*****)#g8l7evsu"),
        Network::Bitcoin,
        MemoryDatabase::default(),
    ).unwrap();

    println!("address: {}",wallet.get_address(AddressIndex::LastUnused).unwrap());

    wallet.sync(&blockchain, SyncOptions::default()).unwrap();

    println!("Descriptor balance: {} SAT", wallet.get_balance().unwrap());

it`s print

But the balance of the above address is not actually 0
https://mempool.space/address/bc1pmkztrqn0jv4wtzjza7c5s4ne85xc06vg3e3ep9wgsqhgkz6xru3qq497pt