By testing do you mean using the Alipay app in Malaysia stores? It will not work.
But don't worry. Wise card + Alipay will work in China.
Spending more than 200RMB will incur 3% charge.
My best tip - Wise card isn't the best. The best card for foreign spending is none other than TnG Visa.
Work 100%? OG is WeChat Pay China.
Alipay sometime does not work or isn't accepted in remote areas, such as paying for bus fare/tickets in Jiuzhaigou.

Malaysians setting up WeChat Pay CN just need to upload passport scan and wait for verification pass, which is usually quite fast.

I've never used Alipay other than their QR Transport code after using WeChat.
Most of the payment, ordering are all in WeChat.

Anyway, if the merchant or shop uses personal QR, what payment method will not work, unless you buy WeChat/Alipay balance. They don't allow card transactions for personal transfers.
TouchNGo doesn't work if the merchant QR is personal QR. It will say QR code invalid (Similar issue in TH Promptpay).