Non-uniform convergence of solution for the Camassa-Holm equation in the zero-filter limit

In the short note, we prove that given initial data ${\mathcal{u}}_0\in H^s(\mathbb{R})$ with $s>\frac{3}{2}$ and for some $T>0$, the solution of the Camassa-Holm equation does not converges uniformly with respect to the initial data in $L^{\mathrm{\infty }}$ $(0,T;H^s(\mathbb{R}))$ to the inviscid Burgers equation as the filter parameter $\alpha$ tends to zero. This is a supplement to our recent result on the zero-filter limit.