I haven't lost any corals to this particular fish.
I
have lost corals to different Angelfish species in the past so I somewhat learned what to avoid: especially the fleshy "open brain" type corals (Cynarina, Scolymia, etc.) although there's been a Symphyllia in my aquarium with "Junior" (my Emperor) since day one. (I aquired this fish as a late stage juvenile/emerging adult).
I have zooanthids. I've never seen Junior even bat an eye at them. (The shrimp's cleaning station is directly above patches of zooanthids in my aquarium.) My Emperor (and all Angelfish in general IME) are prone to pick at unhealthy corals, although if mine gets overly hungry he'll go straight for terminal polyps on my healthy stag Acropora. He'll also nip at my gigantea carpet anemone if the Clownfish's guard goes down.