When I uninstall Minecraft and reinstall Minecraft it caused all my worlds to not be playable and say failed to sync data whenever I try to play them. It also has a gray background and I really need to fix this. It has been going on for about a month.
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Please help me fix this issue, couple thousand hours of progress went down the drain and your stupid updates cause this and you arnt even trying to fix it. You know the issue and you know how to fix it so please fix it. (It’s the update where you can’t get any outside texture packs or skins etc)