I noticed this first when using a SubD controller mesh, but it also happens with a regular mesh:
- Make a mesh (MeshBox in attached) on one layer (color is black)
- Change mesh to a different layer (color is magenta)
- Use gumball extrude to add sets of mesh faces, new edges are the current magenta layer color, but original mesh box edges are still black. When a regular mesh in shaded mode and not a subD controller, the faces are properly colored, but edges are not.
V5 does not show this behavior.