Shankar–Tsimerman's Jacobian isogeny conjecture for abelian fourfolds

Let $p$ be a prime, let $A$ be a $4$-dimensional abelian variety over $\overline{\mathbf{F}}_p$, and let a stable curve be allowed to be possibly reducible. Shankar–Tsimerman's conjecture. The variety $A$ is isogenous to the Jacobian of some stable curve.

This conjecture asks whether every abelian fourfold over an algebraic closure of a finite field lies, up to isogeny, in the Jacobian locus after allowing stable reducible curves. The source attributes it to Shankar–Tsimerman and does not state that it has been resolved.