Will Turn Undead work on a corpse possessed by a Dybbuk (a demon listed in Mordenkainen's Tome of Foes, p. 132)?
Background: I thought yes, as the creature is a raised corpse, an undead. However I was just listening to a podcast where the party faced a corpse possessed by a Dybbuk. The DM ruled (very convinced and prepared) that turn undead could not turn the creature. As far as I understood the argument, it's because it is actually the Dybbuk acting, which is not undead. While the DM can of course rule whatever he wants, it also makes sense to me. What would happen RAW? And if there is any RAI statements like tweets on it, that would also be nice to know.