This has been the status quo for a while. China is very sensitive about Taiwan. There have been several spats between China and airlines in the last few years;

This has been the status quo for a while. China is very sensitive about Taiwan. There have been several spats between China and airlines in the last few years; for example, https://www.businessinsider.com/united-airlines-makes-concession-to-recognize-taiwan-angers-china-2018-8 https://www.businessinsider.com/united-airlines-makes-conces...