So of recent many people got there withdrawal suspended due to a potential poisoning address attack after receiving payment for rainbet campaign managed by Hhampuz, this is common with KuCoin exchange users
How did you get that information? Is there any place the exchange mentions about blacklisted transactions?
All I see is two similar addresses show mempool show a warning like it could be an attack but if it's actually two different addresses, then there should be no problem with that. Certainly, exchange's blacklisting seems weird to me.