Subag's Jantzen quotient conjecture

Let $\sigma$ be a real structure of an algebraic family of Harish–Chandra pairs $(\boldsymbol{\mathfrak{g}},\boldsymbol{K})$, let $\mathcal{F}\in\widetilde{\mathcal{M}}(\boldsymbol{\mathfrak{g}},\boldsymbol{K})_{\mu}$, and let $[\alpha:\beta]\in\mathbb{R}\mathbb{P}^{1}$. When a nonzero rational intertwining operator from $\mathcal{F}$ to its $\sigma$-twisted dual exists, it determines a Jantzen filtration, and $\widetilde{J}_{\mu,[\alpha:\beta]}(\mathcal{F})$ denotes the unique Jantzen quotient containing $\mu$. The notation $J_{\mu,[\alpha:\beta]}(\mathcal{F})$ denotes the unique composition factor containing $\mu$. Subag's Jantzen quotient conjecture. For every $[\alpha:\beta]\in\mathbb{R}\mathbb{P}^{1}$ and every $\mathcal{F}\in\widetilde{\mathcal{M}}(\boldsymbol{\mathfrak{g}},\boldsymbol{K})_{\mu}$ for which $\mathcal{F}|_{[\alpha:\beta]}$ is reducible,

$$\widetilde{J}_{\mu,[\alpha:\beta]}(\mathcal{F})\simeq J_{\mu,[\alpha:\beta]}(\mathcal{F}).$$

The claim would provide a method for computing the composition factor used in the correspondence from Jantzen filtrations; it is stated as an additional conjecture and is not resolved in the paper.