Lost Cities ver 2.0.7, Lost Souls ver 1.1.4, mod list at /r/MaginateMC.

We have a player on our server who's building in a magical forest biome and near him, we're randomly running into chunks that are saying they're haunted when there are no buildings there.

Maybe related - I performed a retrogen for Astral Sorcery recently, but I don't think that would affect it?