World Machine Tiled Terrain Import

Hi,
I followed the informations on the Unreal Engine wiki (A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums) on how to import a tiled terrain from World Machine to Unreal Engine 4 and I always get this weird bug :

I set up the terrain to be 4x4 tiles like in the tutorial but when I import the 16 tiles in the Engine I only get 9 of them.
Same thing with the weight map as well.

I don’t know if it’s a bug or if the tutorial has not be updated since I use Unreal Engine 4.4.
Thank you for your help.

It wasn’t a bug, I found the problem.

It’s just that in the Levels tab, as World Composition was enabled, all the imported tiles were not shown :

And I needed to enable their visibility all at once so they show up in the level.

Problem solved !