Abilities have not been properly reverting in Benjamin Butterfree. My opponent's treeko was able to absorb a thunderbolt by retaining the lightningrod ability it had as a mega sceptile, and my haunter took spikes damage even though its ability was supposed to revert to levitate after devolving from gengar.
https://replay.pokemonshowdown.com/gen7benjaminbutterfree-786561980
https://replay.pokemonshowdown.com/gen7benjaminbutterfree-786561980