why web3.eth.getBlockNumber().then(console.log) returns 0

I have build a Ethereum Full Node in Ubuntu 18.04. geth is running through the following command:

nohup geth --rpcaddr 127.0.0.1 -rpcport 8545 --rpc -rpcapi "wb3,admin,eth,personal,net" --ws --wsaddr 127.0.0.1 --wsport 8546 --wsorigins "*" --datadir "/data/ethereum" --syncmode fast --maxpeers 10000 --cache 8196 >> geth.log 2>&1 &

one line of geth.log content:

INFO [06-06|00:59:22.250] Imported new block headers               count=1    elapsed=6.793ms     number=10206927 hash="92683d…04062d"

truffle is configured as the following:

development: {
     host: "127.0.0.1",     // Localhost (default: none)
     port: 8545,            // Standard Ethereum port (default: none)
     network_id: "*",       // Any network (default: none)
    }

In truffle console, when I use command web3.eth.getBlockNumber().then(console.log), it just returns

0
undefined

Why is it not 10206927(from geth.log) or a close number?

Thanks in advance!

   this.web3.eth.isSyncing((error: Error, sync: any) => {
        if (!error && sync) {
            console.log(sync.currentBlock);
            console.log(sync.highestBlock);
        }
    });