Time evolution of the mass transfer rate (upper panel) and the donor mass as well as the cumulative mass of metals M_Z transferred through L1 since RLOF (lower panel) in five exemplary binary models in which the position of the donor in the HR diagram is consistent with the AT 2018bwo progenitor (see Fig. 10). The mass transfer rate at which the donor is consistent with the AT 2018bwo progenitor (marked with bold in the figure) depends on the initial mass of the donor. The evolution of Ṁ is distinctively different in the 16 M_⊙ case because of a shallow outer convective zone in the envelope of the 16 M_⊙ donor at RLOF.