I'm in a new singleplayer world in the newest snapshot (at the time, 18w44a), every time I die in the world, I click "respawn" and the entire world is gone, I have to save & exit, then rejoin the world just to get it back.
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This is not a complaint or anything, it's just to inform you..
It might not even be the version of the game that's causing it, it might just be my computer, I can't really test that theory.