If you die in hardcore mode and then hit the “view world” button to respawn as spectator mode, you will not be able to load chunks properly (specifically, only the area around the chunk you spawned will be loaded, and nothing outside of that area will be loaded at all).
This situation causes behavior that would normally be impossible (water flow does not spread, mobs cannot move, and they do not despawn).
If you close the world and re-enter it, no chunks are loaded at all.
Environment
Ryzen 7 5700X
RTX 3070 Ti
Linked issues
Comments 2
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We are tracking this issue in MC-157812, so this ticket is being resolved and linked as a duplicate.
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This is because the game rule
spectatorsGenerateChunksis turned off by default when dying in a hardcore world. Turning this on by using/gamerule spectatorsGenerateChunks truewill fix this issue.