Killing Mobs and sending through end portal at the same time, doesnt drop its loots

In 1.15.1, I tried to send a donkey with 1 hp through end portal with water stream, the donkey should be kill by the lava as shown in pic, the bottom right shown the sound of the donkey is being killed, and its loots should be dropped as shown.

but in 1.15.2, same scenario, the loots are not been dropped