Chunks will go in and out of render, even though player is on them, or near them.
Log onto minecraft, open a survival world (without optifine!)
Walk around. Chunks will flicker in and out of existence
Chunks should stay rendered when the player is able to see the chunk.
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This has actually been happening for a few versions now. For some reason using optifine fixes the issue (however I shouldnt have to download external programs to make the game I paid 30 dollars for run smoothly)