I have often measured this current in the past....
For example , in a flyback, when the fet turns on, the voltage across the capacitance of the output schottky is suddenly increased.....and this must be accompanied by a large current spike , since as you know , i = cdv/dt.
..this current spike is transferred through the transformer, and goes through the fet as it turns on....
also, the drain-source capacitance is suddenly discharged by fet turn on , and that adds to the current spike.
so i am certain that these current spikes exist.