This is 100% a software issue.
I investigated a bit more and found a lead. The ones with the stock camera software are okay. Worse than the FF4 but usable for social media.
The ones that didn’t work were taken with gcam, open camera and blackmagic cam as I was testing alternative camera apps. It seems to me like the API for third party apps only exposed a near-range mic designed for phone calls. Only sound that’s very very close gets recorded. To say it differently: you can’t hear 20 kids singing around a fire 3 meters away but you can hear my cough holding the phone… It’s THAT bad!
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