The server doesn't send information about entity death to dead players

The bug

While a player is dead, the server doesn't notify it of other entities that are killed while the player is in the death screen.

To reproduce

You'll need two accounts that can join the same world to reproduce this issue. It's also possible to reproduce the bug by using commands or redstone if you know how to do that.

1. Player 1 places some boats in front of player 2
2. Player 2 kills itself
3. Player 1 destroys the boats while Player 2 is in the death screen
   → The boats don't disappear on Player 2's death screen
4. Player 2 respawns
   → The boats are now invisible, but their hitboxes remain.

Videos

From Player 1's perspective: Minecraft 19w44a 2019-11-07 14-09-13.mp4
From Player 2's perspective: Minecraft 19w44a 2019-11-07 14-08-57_Trim.mp4