To recreate: - stage a batch of authority records - go to manage-marc-import.pl for that batch - click Apply Different Matching Rules (it doesn't matter whether or not you change something before you click it) - Koha gives a message of "Changed item processing option" I don't see an actual issue with performance here -- item processing is irrelevant for authorities, which is why we don't see those options -- but it's slightly confusing and should be removed.