Second, Chinese culture is understood as being that of the Han majority culture, and it is increasingly criminal to suggest otherwise. The documentary The War in the Shadows describes how editors and publishers associated with Uyghur and Kazakh language textbooks for primary and secondary schools were recently sentenced to death or life in prison. Their alleged crime is to have included in the textbooks a high percentage of indigenous material and readings regarding historic figures who were not from today’s China or who rebelled against Han oppressors.

Third, earlier this year, the Legal Affairs Committee of the National People’s Congress ruled unconstitutional any items in local autonomous laws which support the use of minority languages in local schools as a medium of instruction. In their first constitutionality ruling, the committee accused them of violating the constitutional article on Putonghua promotion.”

Source: https://www.eastasiaforum.org/2021/06/04/multiculturalism-in-china-from-melting-pot-to-pressure-cooker/