Reduced universal character-ring conjecture for knot complements

For a knot $K$, let $X$ be its complement and let $\mathbb C^{\mathrm{univ}}[\chi(X)]$ denote the universal $SL_2$-character ring of $\pi_1(X)$, equivalently the skein module at $t=-1$ under the stated identification. A ring is reduced when its nilradical is zero. Reduced universal character-ring conjecture. For every knot $K$, the universal $SL_2$-character ring is reduced. If true, this would identify the universal character ring with the coordinate ring of the $SL_2$-character variety for every knot complement; the supplied context lists several classes where reducedness is already known, but gives no resolution in general.