Do nations care about "war crimes?" That's a subject for us philosophers. I don't believe China could care less about Gaza. China only cares about Middle East oil and containing Muslim terrorist groups close to its Western borders. At some point, the CCP might use TikTok, but not yet. Were they to use it here the U.S. would shut it down. They'll wait for when it's worth it to risk that.
I don't see what China has to gain one way or another from the Gaza situation. If anything, I believe China would love to do more military tech transfers with Israel. If they don't care about their Uyghur Muslims why those in Gaza? Indeed, the CCP is probably laughing at how well they dealt with their Muslim terrorists vs Israel. Of course, China is big enough to hide what they did. Israel has no such luxury.
That's my view!