Flat ground tile meshes look like full cubes in the Gridmap

Question

My meshes actually look like this: https://i.imgur.com/TCvvFKa.png (they are just blender cubes with size z=0.1 and a custom material)

But in the Gridmap I get full cubes, they look like this: https://i.imgur.com/Fb1of6I.png

Does anyone know what I am doing wrong?

I am exporting the full scene in blender whith the Better Collada exporter (triangulated them) and importing the full scene as inherited scene to Godot to use it as TileSet. Then I do Convert to -> Meshlibrary and import it in the Gridmap

Answer 1

Not sure does this fix it 100% but...
I had the same problem and it has something to do in the exported file format and few blender settings.

For me when exporting in .glb they came as cubes. Then i went to blender (Blender 2.8) and applied rotation scale and all transforms to the object. To access the menu in blender select the object CTRL+ A

Not sure if this fixses everything but made mine work alot better.