Phantoms not spawning in Buffet World Type

So I've been playing a server with my friends on the Buffet world type as a cave world. We finally got to the stage of completing the ender dragon and getting our Elytra's. We have also found a hole above the bedrock ceiling generated by the world type. Seeing as we are in a cave world there is little to no reason to sleep at night other than to set our spawn, thus I haven't slept in nearly 24 hours of play time according to the statistics page so I know I am far past the 3 days in game time requirement. Yet even on the surface of the world where I am exposed to sky light there has been no phantom spawns. I believe this is a bug with the buffet world type and would really like to see it corrected because not being able to repair our elytra is no fun at all.