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I would not worry about this from a battery drain perspective. 20k load across 12 volts is less than a milliamp. Your battery will not notice this, and it will be far less than the normal internal discharge rate of the battery.
50Ah / .6mA > 83,000 hours.

My suspicion is that it is the normal load of some internal electronics internal to the motor, perhaps memory storing engine data or some such.

Dennis