Something very annoying happened to me while preparing a converted scene.
As you can see, there are visible seams along the bucket edges.
I'm currently working on breaking down the cause and will upload the scene then.
edit #1:
I was able to break the problem down to the use of Vertexmaps in combination with a Colorizer-Shader.
edit #2:
The bug is definitely caused by the layer-shader in combination with vertexmap. Vertexmaps only work fine. :)
edit #3:
After testing around for a while, I have to conclude, that all "pass-through" shaders like Layer, Fusion, etc. are not evaluated correctly.