High pitched noise in right piece airpods

I just bought airpods gen 2 without wireless charging in december 2020. There's ringing noise in the right piece like a static noise. Even if I didnt use it, the right piece still produced the noise. Already sent to apple service in my town, Jakarta, twice. But until now, the noise still there.

I dont know if it's malfunction or normal on all wireless earphone. I have tried my friend airpods pro and there's no ringing noise. But I didnt like the plug-in earphone. Guess I'm going back to classic wired earphone, sigh