One attempt involved a battleship “accidentally” firing onto another battleship where both Hu Jintao and Xi Jinping were visiting.
https://jamestown.org/program/president-xi-suspects-politica...
Biased source, but she’s able to get a lot of unreported news from the mainland.
https://www.jenniferzengblog.com/home/2021/9/20/deleted-repo...
I will try to find more sources but Google is just shit these days. See my other comment for more.
A big problem is that mainland China is like the hermit kingdom. It’s a black hole for any news the CCP doesn’t want to get out