We've identified an issue in the current Minecraft Beta and Preview version that causes chunks to become corrupted below Y=0. To avoid corrupted chunks, please refrain from opening your worlds until an update has been released. - jhp
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To keep your information secure, please complete our request form at msft.it/6014w78S2 so we can quickly and safely assist with your question! ^FF
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Replying to @Matthew94482137
One of our agents will reply to you as soon as possible. You'll receive the reply to the email address that was provided in the support request form. We're experiencing a higher than normal volume of requests right now, and we definitely appreciate your patience. ^FF

Apr 23, 2022 · 11:32 PM UTC

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Replying to @MojangSupport @Matthew94482137
I'm sure you guys are getting a lot of requests because this entire migration is a nightmare. I'm sure my son is not the only person who can't get into their account anymore. Hotmail is the worst and making us switch to them was awful.