Murakami and Yasuhara's sharpness conjecture for the non-orientable slice genus

Let $K$ be a knot, let $g_4(K)$ denote its smooth orientable slice genus, and let $b3_4(K)$ denote its smooth non-orientable slice genus. A knot is non-slice if $g_4(K)>0$. Murakami and Yasuhara's conjecture. There exists a non-slice knot $K$ such that

$$\gamma_4(K)=2g_4(K)+1.$$

Murakami and Yasuhara proved the general inequality $\gamma_4(K)\leq 2g_4(K)+1$; the conjecture asks whether this bound is attained by some non-slice knot.