Karpenko's anisotropy conjecture for orthogonal involutions

Let $A$ be a central simple algebra over a field $F$, and let ${\mathcal F}_{A,o}$ denote the function field associated with $A$ and orthogonal involutions. An orthogonal involution on $A$ is anisotropic if it has no nonzero isotropic elements. Karpenko's anisotropy conjecture. An anisotropic orthogonal involution remains anisotropic over ${\mathcal F}_{A,o}$. This conjecture asks whether anisotropy of orthogonal involutions is preserved under passage to the generic function field associated with orthogonal involutions. The supplied text does not state whether the conjecture has been resolved.