To whom does the Zakat al-Fitr of a slave bequeathed (Wasiyya) belong if the legatee accepts or the testator dies under specific circumstances?

Primary text

If a testator bequeaths a slave and dies before sunset, and the legatee accepts the bequest only after sunset, then in one view, the Zakat al-Fitr is upon the legatee. In another view, it is upon the heirs of the testator, depending on whether the bequeathed item transfers ownership upon death or upon acceptance. If the legatee dies before refusal or acceptance, and their heirs accept, in one opinion, the Fitr is on the testator's heirs because ownership transferred via acceptance. If the testator's death occurs after the sighting of Shawwal's crescent, the slave's Fitr is in the legatee's estate because the heirs accepted it on their behalf. If the death occurs before the sighting of Shawwal's crescent, the Fitr is on the heirs.