Relion implements the classical approach from MATLAB’s padarray with ‘replicate’ - you get those streaks on the edge as the last values in each row or column are repeated out to the required size. It doesn’t create as many artifacts as a step edge. In practice the streaks usually end up outside the circle mask. If a particle is actually cut by the micrograph edge then I wouldn’t use it in any case.
If you want to try this behavior now, why not extract the particles in Relion and then bring them back into cryoSPARC?