According to Binance official announcement, Binance Chain has been upgraded. The validator node has also been switched to V 0.6.1 and the new function has been activated since 13:00 on August 5 (block height: 25,120,000). The upgrade includes BEP12, which allows exchanges to reject the deposits without a valid memo.
Mixin Network has completed the support of upgrade for Binance Chain, the deposit and withdraws of BNB and BEP 2 assets can proceed normally. When you deposit BEP 2 assets to exchange, the memo must be filled in, the memo is composed of numbers. If you fill in a wrong format memo, Mixin Network will send back the withdraw, but the gas fee will be charged with no refund.