Feel free to read the yearly reports from the HRW:
https://www.hrw.org/world-report/2023/country-chapters/china
Random selection from the report:
> In May, a court in Hainan province sentenced former journalist Luo Changping to seven months in prison for a Weibo post that questioned China’s justification for its involvement in the Korean War.
Details on his case: https://en.wikipedia.org/wiki/Luo_Changping#Arrest
> Sanya Ji'an Police Bureau summoned Luo for investigation into his "illegal remarks" suspected of "insulting heroes and martyrs".