Pappas–Rapoport–Smithling topological flatness conjecture for naive local models

Let $F/F_0$ be a quadratic extension, let $(V,\phi)$ be a symmetric space of dimension $2n+2$, and let $I\subset [0,n]$ be non-empty. Let $\RM^\naive_I$ be the naive local model over $\CO_{F_0}$, whose generic fiber is the orthogonal Grassmannian of maximal totally isotropic $(n+1)$-dimensional subspaces of $V$. Pappas–Rapoport–Smithling's topological flatness conjecture. The naive local model $\RM^\naive_I$ is topologically flat. This means that its generic fiber is Zariski dense in $\RM^\naive_I$; the supplied source does not specify whether the conjecture is resolved.