Such incidents have been extensively described. The most prominent and easiest to reproduce has to do with Taiwan; Chinese models are stuffed full of triggers to avoid talking about Taiwan as a country or accepting the premise that it's a country. Try asking Deepseek about country code +886!
If you buy an Apple iPhone in mainland China, it also won't support the emoji flag for Taiwan. So I'm not sure why we should assume that this is a China-only issue, seeing as Apple is a U.S. based company.
Sure, but I don't talk with my coding agent about politics. And its something different to avoid a topic and to deceptively implement a backdoor.