Vertical Line and Color Banding (Greyed Black Color)

This problem happened when i set a low brightness and the refresh rate of 90Hz is the worst.
Now this problem also happened in low brightness. There's a super thin vertical line on the middle and refresh rate of 120Hz got the worst one.
Is this only happened to me or many people also got this problem? Any idea what happened here or how to fix this? I already emailed asus about this and waiting for their response.
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Weird, this was a problem some time ago on Android 11, and it was fixed around September/October, are you sure that you are on the latest firmware?
The latest in my country (indonesia) is still android 11, i think the update for my place would be this or next month. I've brought my phone to the service center and still waiting for the repair, they suspect this problem is from the hardware.