Evolution of the pebble accretion rate (top) and planet growth (bottom) for the same cases as in Fig. 5 (disc of M_d,0 = 0.06 M_⊙ of the nominal setup). Bottom panel: the solid lines show the growth of the core, the dashed lines the growth of the envelope, and the dotted thin lines the evolution of the pebble isolation mass foreach case. The accretion rate of pebbles is shut down very early for the case of α = 10⁻⁵ because M_iso is attained.