More specifically there were a few lab escapes of coronaviruses (SARS) in China that Beijing copped to in the early 2000s [1]. It happens to everyone, way more than it should. Yes, including America. [2]

[edit] To be clear, I'm not saying this definitely did or did not happen, I don't know. I'm saying if it came out later that it did, I wouldn't be surprised.

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7096887/

[2] https://en.wikipedia.org/wiki/List_of_laboratory_biosecurity...