As has been said above...Yes and No.Squish ....................................as in the tip of the nozzle & combined flow of hot filament flattening the hot extruded material into the rest of the print whilst it's very hot to fuse the two layers together? ( aka lower th nozzle as TFL said ?)
So my in my sclerotic brain conversion this is ...... the stepper motor feeds the filament at microscopically faster speeds in the slicer programming to feed a little more molten filament through the print nozzle at the right time to fill known to the programme voids that are a result of the slicer doing it's job?
Squish encourages adhesion. But also squashes the 0.4 mm bead coming out of the nozzle.
With no squish you end up with a line of plastic just touching the build plate at the very bottom. (Like a round garden hose)
So the no part is the stepper motor does not compensate to fill in the voids. To confuse things it might do something similar when creating a smoother finishing shell. But NOT at the start.
Does the prusa have baby stepping?
Sorry I am not too much help as I don't have a prusa or use prusa slicer.