A big bunch of chunks will disappear on a flat world after the update 1.17.30 for Minecraft bedrock.
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We're tracking this issue in MCPE-140428, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. Please check the Fix Version/s field in that ticket to see in which version this behavior was or will be fixed.
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This has been fixed in 1.17.32, please update your game.