Trying to rename any item in the anvil isn't working right. You can't delete the original name, you can only add letters to what's there. Anything you add can't be deleted either.
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Comments 2
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We're tracking this issue in MC-266886, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. Please check the Fix Version/s field in that ticket to see in which version this behavior was or will be fixed.
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Duplicate of MC-266886, fixed in pre release 2.