There's also essentially no risk to China for the whole northeastern subcontinent to be in chaos either.
Sure PLAGF isn't battle proven like AFU and RU Army is, but most people, even some US nationalists, still credit them with being the strongest land army in the world. Moreover as seen in Xinjiang they are not just brute force only but can actually do counterterrorism arguably better than any other force on earth has shown so far.
For middle powers like Iran and Israel, maybe it's hard to deal with instability on the border, and they can provide a route for foreign intelligence agencies. But for China, PLA can slap down any attempt to cross the border without even trying, and if they get dragged into participating in the war, let's just say without even air defenses, they would also just get wiped with minimal effort.