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UPDATE:
My dealer discovered today that BMW issued service bulletin SIB 34-06-20 in June to address the complaint that "noise from the dynamic stability Dynamic Stability Control (DSC) can be heard when driving rapidly over speed bumps."
The bulletin instructs dealers to update the DSC Control (CTRL) program on x-drive G20 vehicles produced between October 2018 & June 2019. Mine was produced outside those dates, but apparently the dealer believes it may may correct the problem in my car, too.
My guess is that BMW may have revised the original DSC programming so that driving over speed bumps will no longer trigger the DSC and create a slight knocking sensation that can be felt up through the steering column.
To be clear, my car only made the noise intermittently when driving slowly over speed bumps, so time will tell if the revised programming works.
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