Generally, small pieces of bread or Matza that are cooked in liquid lose their Hamotzi status ad would become Mezonos, as the new Bishul undoes the original baking. However, here the bowl is merely a Kli Sheini and does not create Bishul at all. Therefore, as long as the pieces have not completely lost their original appearance and dissolved into a shapeless mush, they retain the initial Beracha of Hamotzi. See Mishna Berura 168§52.