Cant get RiverWaterBody to work with converted static mesh to MeshTerrain.

Hi,

I am using UE5.8 preview, and am having some trouble implementing some water bodies with MeshTerrain.

Replicate:

  1. Duplicate MPD_Default to MPD_World and create a water layer.
  2. Create Plane then scale it up. Go to Mesh Terrain Mode. Select Plane and click convert so you convert the plane to a Mesh Terrain Object, set the definition to MPD_World.
  3. Select MeshPartition (object created in previous step) add MeshPartition component.
  4. Create WaterBodyRiver actor and place on terrain.
  5. Add RiverModifier component to WaterBodyRiver actor.
  6. Set AffectedMeshPartition to the mesh partition created in step 2. Set PriorityLayer to the water layer created in step 1.
  7. Nothing happens.

I have attempted this entire process agaub but instead of converting an existing mesh, i create a MeshTerrain from scratch using the “Create Rectangle” button. Then I add the river in the same way, and this does seem to create a river correctly. I attached two images in case it helps.

Does anybody know if I am doing something wrong or is this something that will be patched soon?