It was an old bug since 1.2 Update. But this bug is very annoying. I named my Gamertag as "PhrotonXPG"...after re-opening minecraft, It was just changed back into the username that I didn't set at all.
On the screenshot, You may see "WarnBucket" that I didn't set. It was actually "PhrotonXPG"
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Cleaning up old tickets: This ticket has not been updated recently so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Moved to the correct project. Please use BDS only for issues with the bedrock dedicated server, and MCPE for general bedrock.