Hmm if it helps my 10k driven Altis does the same on reverse but it seems to come only when I apply the brakes sharply in reverse slight tuck sound but not on turning steering and like you only when car is been sitting for a few days
No sound while moving forwards
Brakes suspension etc all checked numerous times no issues
Seems like a trait of local assembled civics and Altis here lol they like to knee moving forward
I would suggest have a check with a crowbar of the suspension and steering components as well as engine or gearbox mounts incase there is a manufacturing defect but I think nothing will be wrong can be ignored
I checked mine loads of times nothing wrong so I don't bother hardly ever hear it
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