Faber's conjecture on free divisors and normal crossing singularities

Let $D$ be a free divisor. It has normal crossing singularities if, locally, it is defined by an equation whose irreducible components are smooth and meet transversely. It is normal crossing in codimension $1$ if there is a subset of codimension at least $2$ outside which it has only normal crossing singularities.

Faber's conjecture. A free divisor has only normal crossing singularities if and only if it is normal crossing in codimension $1$.

The conjecture asks whether the local normal-crossing condition is determined outside a codimension-$2$ subset for free divisors. The preceding proposition establishes only that a reduced free hypersurface with Du Bois singularities is normal crossing in codimension $1$; the stated equivalence remains open in the supplied source.