Loehr–Warrington rational $q,t$-Catalan specialization conjecture

Let $\mathsf{Cat}_{a,b}(q,t)$ be the rational $q,t$-Catalan number and let $[m]_q$ and $\genfrac{[}{]}{0pt}{}{a+b}{a,b}_q$ denote the $q$-integer and $q$-binomial coefficient. Rational $q,t$-Catalan specialization conjecture.

$$q^{(a-1)(b-1)/2}\mathsf{Cat}_{a,b}(q,1/q)=\frac{1}{[a+b]_q}\genfrac{[}{]}{0pt}{}{a+b}{a,b}_q.$$

This predicts that the rational $q,t$-Catalan polynomial specializes, after the stated rescaling, to the rational $q$-Catalan polynomial; the supplied text does not state its resolution.