When the player is wearing armor with the mending enchantment, holding an item with the mending enchantment, and gains experience, the experience has a chance to repair their armor or tool (if it they are damaged) or go to the player's level count. This means that while players try to repair tools while wearing mending armor, the process is slowed down by the experience going to the level count.
Linked issues
duplicates 1
Comments 3
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We're tracking this issue as MCPE-36964, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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WAI, this is a feature to the mending