[Gameplay] - Overworld and Underworld

[Vertimere]

Bug Submission:

Category: Gameplay

Issue Title: Overworld and Underworld

Issue Description: While playing DST with a friend, he was in the overworld (i.e. world surface), while I was in the caves. We have two servers set up to allow for us to go between both the surface and the caves. When he died on the surface, the game detected that all players were dead and began to reset. When I came through the portal from the caves to the surface, the game didn't recognize my presence and the surface world reset. Shouldn't the game detect that a player was present?

Steps to Reproduce: I was in caves, my friend on the surface.

He died on the surface, the world began to reset. I came back through the portal from the caves to the surface successfully before the world reset completed. The world still reset.