Virtual simplicity conjecture for lattices in exotic affine buildings

Let $X$ be an affine building of type $\widetilde A_2$ that is not isomorphic to the building associated to $\mathrm{PGL}_3(D)$, where $D$ is a finite-dimensional division algebra over a local field, and let $\Gamma$ be a lattice in $\operatorname{Aut}(X)$. Virtual simplicity conjecture. Then $\Gamma$ is virtually simple. The question concerns normal subgroups of lattices in possibly exotic affine buildings; finite-index normal subgroups are abundant for linear lattices, while the existence of finite quotients for non-linear lattices is not understood.