Cannot decode Tx memo on mainnet

[Sotatek-SinhVu]

Here is my transaction detail in the mainnet:

https://dex.binance.org/api/v1/tx/16908395AE595CB6D3E33F857A7E1934F3A0BD7F920F73AE90232DB5A959AB0C?format=json

As you can see, the memo is:

"data": null,
"memo": "AVA_D_021189",

But, when I tried to decode raw tx above, it is:

3gHwYl3uClgqLIf6CigKFMm3DGlwDnrl8oUv/XuUcGS9pSBjEhAKB0FWQS02NDUQgICz/8QDEigKFEVc1zZPMVGEI/wwNXGZG6jdXLDSEhAKB0FWQS02NDUQgICz/8QDEm4KJuta6YchA5DMmRpyXoWfDeEKwECe+PVqqKEJHWQmGMhNou4rSireEkBccrwLsoJk8uNcl7GTVGhdwGdeyjugUfLnU1UeWoKJYT8D3LDWt2N6BU7yKadlWvJ/Lsh44xMJl3oXWS9m1LzXGJecFBoMQVZBX0RfMDIxMTg5IAI=

And here is the response after decode:

  memo: '',
  source: 0,
  data: '',
  msgType: 'StdTx' }

@antoncoding do you have any information about it?

Here is my source code:

    const bytes = Buffer.from(rawData, 'base64');
    // currently only supported transfer type
    try {
      const tx = bnbDecoder.decode(bytes.toString('hex'), config.network === 'testnet');
      console.log(`tx=========`, tx);
      return tx;
    } catch (err) {
      // if error, it mean it maybe not transfer tx
      return null;
    }