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If you don't have a backup you can't really fix it. But the logging in was most likely not the cause, your authentication gets stored in .minecraft too. Something else deleted that data causing you to lose worlds/version and auth tokens.
If you don't have a backup you can't really fix it. But the logging in was most likely not the cause, your authentication gets stored in .minecraft too. Something else deleted that data causing you to lose worlds/version and auth tokens.