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It’s hard to tell without a circuitry layout, but my best guess is that there’s probably capacitors in the power brick acting as an electrical filtration for the motors to make them operate smoothly and reliably.
The capacitors are probably discharging some electricity that are keeping some circuit protective device alive. Unplugging the power brick is probably the only true way to completely remove electricity from the unit.
Could also be the exact opposite (experienced this with consumer grade electronics based on microcontrollers often enough):
Because of the large capacitors, voltage from the power brick kinda "ramps up" when it is plugged into the wall. The device/its MCU/most specifically its clock circuit however prefers a hard edge of power being turned on, to reliably trigger its power on reset circuit/oscillator.
You can think of it similar to a pendulum/newton's cradle/metronome - they also prefer one decisive push to get going reliably.
Unplugging the brick for a longer time is still worth a try, but it could also be this.