Perron's conjecture on the mod-p extension of the Casson invariant

Let $g\geq 3$ and let $p\geq 5$ be prime. Let $\mathcal{M}_{g,1}[p]$ be the mod-$p$ Torelli group, $\mathcal{T}_{g,1}$ the Torelli group, and $D_{g,1}[p]$ the subgroup generated by $p$-powers of Dehn twists. For $S^3_\varphi\in\mathcal{S}^3[p]$ with $\varphi=f\cdot m$, where $f\in\mathcal{T}_{g,1}$ and $m\in D_{g,1}[p]$, define $\gamma_p:\mathcal{M}_{g,1}[p]\to\mathbb{Z}/p$ by

$$\gamma_p(\varphi)=\lambda(S^3_f)\pmod p.$$

Perron's conjecture. The map $\gamma_p$ is a well-defined invariant on $\mathcal{S}^3[p]$. Perron proposed this as an extension of the Casson invariant to the mod-$p$ Torelli group. The supplied text does not state whether the conjecture has been resolved.