When you minimize Minecraft to taskbar, the minecraft world turns black, have no idea why it does this but the only way to fix it is to reopen the world. The mobs are fine, it's just the blocks that are broken.
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Cleaning up old tickets: This ticket has not been updated recently (~7 months+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue and is affecting the most recent versions, then please comment, or create a new ticket following the Issue Guidelines.
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