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It is shown in \cite[J. Differ. Equ., (2022)]{22jde} that given initial data$u_0\in B^{s}_{p,r}$ and for some $T>0$, the solutions of the parabolic-typeKeller-Segel equations converge strongly in $L^\infty_TB^{s}_{p,r}$ to thehyperbolic Keller-Segel equations as the diffusivity parameter $\epsilon$ tendsto zero. In this paper, we furthermore prove this solution maps do not convergeuniformly with respect to the initial data $u_0$ as $\epsilon\to0$ in the sametopology of Besov spaces.

A remark on the vanishing diffusivity limit of the Keller-Segel equations in Besov spaces