After transferring a world, it can't be played cross platform.

I am unsure for this to be a bug, correct me if I'm wrong but after transferring my Minecraft Switch Edition world to minecraft bedrock, also note it's not on the Mario Mash up or using a skin from the Mario Mash up, it will say, "Content active in this world cannot be used in cross-platform multiplayer." Nothing is activated, I'm using a default skin and default texture. If this is no bug and there is already a fix, please tell me?