China has had lab leaks from viral research labs before a few times. However these were all for existing viruses (Sars, bird flu), and it didn't spark much controversy. Mostly because the external impacts were low. The impacts were low because they were identified in the community and isolated etc in time. I doubt it was an accidental leak but if it was then it doesn't follow how how labs have dealt with leaks before.
Leaks have happened in other countries too but I don't the consequences.