Banggala, Vietnamese, Myanmar came to work in Malaysia can speak Malay in just few month even with dialect a bit but can communicate quite well. It is not that some Chinese cannot speak at all, they just don't even want or try. Who cares about not fluent or upside down because those who speak English also many not speaking proper English also.

Many old Chinese taxi drivers who hardly have to speak Malay in Singapore can speak Malay so well even better than many Chinese in Malaysia. Some even sound like Malay