In 89e3ba4e25, the preprocess step was removed because the
normals are lazily calculated. But now we need to fetch the source normals
from the correct placed-- they still were looked for in `CD_NORMAL`.
In 89e3ba4e25, the preprocess step was removed because the
normals are lazily calculated. But now we need to fetch the source normals
from the correct placed-- they still were looked for in `CD_NORMAL`.