I noticed in KSP 1.3 that parts using ModuleResourceHarvester type = 2 (atmospheric) no longer appear to harvest any resource if surface speed is exactly zero, such as if the craft is attached to a launch clamp or has wheel brakes engaged. If there's any motion, such as a heavy craft wobbling on its clamps, or with brakes engaged but can still be tilted side to side, then it'll harvest the resource. This seems to happen regardless of abundance.
This differs from air intakes that can still take in a fixed amount of IntakeAir if perfectly stationary. I originally tuned my harvesters to match whatever the corresponding air intake would harvest in IntakeAir while stationary, then re-tuned that to match the IntakeAir rate times whatever MinAbundance was (assuming MinAbundance and MaxAbundance were equal). Now it seems I'll have to re-tune that based on a fixed non-zero speed.
Or maybe there's an option for a stationary atmospheric harvester to still work. Where can I find changes to ModuleResourceHarvester?