I just did some raiding against team that had Killhare. After Killhare had used its special I did use my Buddy’s special against Jean-Francois and Marjana. Seems like that the new defense debuff from Buddy (or other defense debuffers) doesn’t apply to ones that has Killhare’s debuff as it can’t be dispelled. It was kind of a bummer.
Its not a bug, uncleansable can’t be overwitten