In my case, resetting my airpods pro didn't fix the issue, where left side of the airpods pro not working. But there is a way to fix this issue in different way.
Go to "Audio MIDI Setup" (you can cmd + space to search for this)
Go to AirPods Pro tab (one with outputs)
There should be sliders with '1' and '2', even out both of them (default value should be 0.25 on both sliders)
Done
This solved the issue. Hopefully it will help some people.
tomo3284
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