The answer is "it depends", here's GLM5.3 when asked about Tienanmen Square in 1989:
Yup, it varies between runs (depending on the seed, most likely), but since the knowledge is here it wouldn't be too hard to nudge the model in the right direction with grpo alone.
GLM5.3 provided on Synthetic doesn't seem to have any issue talking about it :
https://i.ibb.co/gZr1kTTB/Windows-Terminal-if-I94ktc-QS.png
It even mentions the censoring.