Does it maintain Mackangdal’s duration?
If so, I say Cleric 1 -> Krivis 3 -> Bokor 2 -> Kabbalist GG
From what I see, it maintains any buff that appears under HP/SP bars and have a duration.
Safe Zone is a buff, but it shows no duration, so Melstis won’t work on it, while Mackangdal has a duration visible, and that’s why it works.