Transfer at Kuala Lumpur airport to Melbourne for transit permission.

When you apply for a transit visa, you must first ensure that you have an Australian visa, but you don't need to apply for a Malay visa. China Customs will allow you to leave the country. I don't know which airport you arrived at in Kuala Lumpur. If it is done at lcct airport, it is next to the entry form after international arrival, diagonally opposite the toilet, and there is a foreign currency exchange office next to it to provide free exit tickets. After the transit pass is completed, you can leave the country directly from the first counter and show it.

I changed planes twice at lcct in Kuala Lumpur, and the counter staff was quick. Have a nice trip.