Montesinos-versus-pretzel characterization of m-stair-step bridge spectra

Let $M_0$ be a Montesinos knot, and let $K={\mathsf {cable}}(T_{m,n},M_0)$ be an $(m,n)$-cable of $M_0$. The bridge spectrum of $K$ is the Montesinos–pretzel bridge-spectrum conjecture. $m$-stair-step if and only if $M_0$ is not a pretzel knot. The conjecture is motivated by the absence of degeneration for 2-bridge knots and by the observed distinction between pretzel and non-pretzel Montesinos knots. The source says there is less direct evidence for this claim, so its status remains open.