China used to buy 50% of Iran's (sanctioned) oil at hugely discounted prices.
Moreover , China paid for that oil in yuan credits which Iran could only spend in China.
That massive subsidy has ended.

Chinese investment markets are manipulated by the CCP to give the illusion of stability, but Chinese fundamentals have taken a huge turn for the worse.

Trump has taken a huge chunk of energy supply business from the Middle East and now controls ~80% of world's tradable energy.

China is at the mercy of the US.

China is in trouble but you'll never learn about it from the UK MSM.