There is in fact significant doubt as to how badly – if at all – the Black Death struck China, and a revisionist school of historians and epidemiologists has proposed that the pandemic may actually have had its origins in the vicinity of the Caspian Sea.

This problem has been discussed here a couple of times, and while there is always more to be said, you might like like to review these earlier threads while you wait for additional responses.

Why can't I find very much information about the 14th Century black death in Asia?, led by u/mikedash

Is there any Mongolian accounts of dealing with Black Plague?, led by u/y_sengaku