When trying to repair a custom item with the minecraft:repairable component. putting multiple of the repair items in the slot of the anvil will show it to be able to repair but when you confirm the repair it does not allow the item to be repaired reverting it back into the anvil not consuming levels but will sometimes damage the anvil. Currently if you put one item instead it will work as expected.
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We're tracking this issue in MCPE-140855, so this ticket is being resolved and linked as a duplicate.
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