in Anvil, put the following:
slot 1: damaged "Bow Unbreaking 1"
slot 2: very damaged simple "Bow"
slot 3 result: "Bow Unbreaking 1"
required XP: 3
now change order:
slot 1: very damaged simple "Bow"
slot 2: damaged "Bow Unbreaking 1"
slot 3 result: "Bow Unbreaking 1" (exact same repair status as in 1st order)
required XP: 5 ...
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