Splitscreen Multiplayer Issue

(10/7) I'm redoing this whole ticket and will attach a screenshot of this.

New Summary: Any and EVERY single guest splitscreen player doesn't show up as <playername>(1) and instead shows as "" in the commands or < > in the pause menu.

How to reproduce:

1. In any world with the splitscreen player...
2. Go to the pause menu or type /kill<space>

Expected Result: Player name should be: <playername>(1)

Actual Result: Player name is: <NULL> or ""