Geometries pink band

I just updated to the latest version (master branch) and I'm seeing strange artifacts on most meshes I plot where a pink band is shown:

```py
from pyvista import examples
from itkwidgets import view

mesh = examples.download_st_helens().warp_by_scalar()
view(geometries=mesh)
```


```py
from pyvista import examples
from itkwidgets import view

mesh = examples.download_topo_land()
view(geometries=mesh)
```