Issue:

When transferring a superflat world from legacy console editions of the game with decorations (flowers, trees, grass, etc.), caves, and / or ravines enabled, on the chunks generated in bedrock, none of these are present

How to Reproduce:

Create a Custom Superflat world on Minecraft Nintendo Switch Edition. make sure you go to "customize superflat" and add a layer of 64 stone. Next, enable villages, decorations, ravines, caves, and strongholds (strongholds are optional) set the world size to classic. open the world, and load a couple chunks. Exit and Save the World. Then, open Minecraft Bedrock Edition, and sync / Transfer the world you just created on Nintendo Switch Edition. Still on bedrock, open the world, and load new chunks. you will see VERY clearly, that all of the new chunks have NONE of the properties you selected on Nintendo Switch Edition.