Generated tiles are flat

I am playing around with Unity and MapMagic2 hoping to build a world to play on my Quest 2. Very new at this so I might not understand your answer ;-)

Building a scene for Android and running it on my Quest 2 goes without problems or errors.

The main MapMagic tile shows as expected. However the generated tiles are completely flat. It looks like the terrain of these tiles doesn't have any height data.

I have tried the Unity VR Template and URP but both have the same issue.

I am experimenting for VR so I'm using the XR Interaction Toolkit do move arround in my scene. There's a Teleportation Aria (script) linked to the MapMagic object in the scene. Teleportation works on the main MapMagic tile but not on the flat once. I can stand and move continuesly on those.

It seems all first generated tiles arround the main tile have this issue. The next row seems to be ok again.

MapMagic 2: 2.1.2
Unity: 2019.4.21f1