China rejects WHO plan for study of Covid-19 origin (dailymaverick.co.za)

To be fair, they probably wouldn't gain anything from this. Doubt that the conclusion of such a study would be accepted.

> We believe a lab leak is extremely unlikely and it is not necessary to invest more energy and efforts in this regard

> However, Liang said the lab leak hypothesis could not be entirely discounted but suggested that if evidence warranted, other countries could look into the possibility it leaked from their labs.

Ok they did it.