If you teleport using the /execute in command to another dimension other than the one you're currently in, the experience bar looks as if it is cleared. This is only a visual bug as gaining (or loosing) any xp will cause it to work correctly.
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SPGoding
Thank you for your report!
However, this issue is a Duplicate of MC-124177.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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