RN7P no stereo audio in video recording - Xiaomi Redmi Note 7 Pro Questions & Answers

Hello. I've run into a strange problem on my RN7P (running on latest stable miui 12 release). When I record a video through either the stock camera app or 3rd party camera apps, the left and right channels of the audio get summed to mono. I used to be able to get stereo audio before but suddenly this happened.
I tested the native voice recorder app and that still gives me proper stereo audio with no problem, and so the issue is definitely not with the microphones. This mono audio problem happens only when I record videos.
Is there a setting somewhere that I messed up? There are no audio settings on the stock camera app and in the 3rd party app (Open Camera), I have the audio settings set to stereo which still doesn't work.

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