wasm: Emoji couldn't show while the text contains Chinese and emoji mix

I have upload a demo to show problem. But I remove NotoSerifCJK-Regular.ttc and NotoColorEmoji.ttf files becourse the size of them is larger than 10M, so you just need to add them to the test project root folder, then run it. You can see some labels with defferent texts. Only Chinese text is OK, and Only emoji is OK, but mix Chinese and emoji is not right. Please check it. If there is any confusion，please tell me as soon as possible. Thank you!