Do I need a Hong Kong and Macao pass to transfer overnight at Hong Kong Airport?

There is something wrong with the way you walk!

With a third country visa, you don't need a pass to cross the border in Hong Kong, as you seem to know very well.

You said you wanted landing visa, Mauritius, and Hongkong wouldn't care about you. It will be released, which is no problem.

But please note that you are not in China?

It is true that some countries implement the landing visa policy for China passport holders, but if you don't have a visa, China Customs won't let you leave the country! You can consult the customs yourself, and you will know what I said is true.

Current method:

1) To apply for a Mauritius visa, you must see the visa on your passport;

2) Apply for Hong Kong and Macao Pass, and then go to Mauritius after arriving in Hong Kong.

Simply put, if you have a visa or a pass, the mainland will let you out. As for overseas visas and passes, there is no requirement for you. That's an overseas matter, and the mainland won't care about that.