O-singular locus conjecture for quantized symplectic resolutions

Let $X$ be a conical symplectic resolution with a Hamiltonian torus action $T$ having finitely many fixed points, and choose a generic one-parameter subgroup $nu$. The category $\mathcal{O}_nu(\mathcal{A}_\lambda)$ has Cartan subquotient $\mathsf{C}_nu(\mathcal{A}_\lambda)$. A parameter $\lambda$ is $\mathcal{O}$-singular when this Cartan subquotient is not a semisimple commutative algebra of dimension $|X^T|$; denote the locus by $\mathfrak{c}^{\mathcal{O}-\mathrm{sing}}$.

$\mathcal{O}$-singular locus conjecture. The locus $\mathfrak{c}^{\mathcal{O}-\mathrm{sing}}$ coincides with the union of singular hyperplanes.

The paper notes that the $\mathcal{O}$-singular locus is Zariski closed and contained in a finite union of essential hyperplanes, and proposes equality with the singular-hyperplane locus. The source gives no resolution status.