  Viscoelastic flows through porous media become unstable and chaotic beyond
critical flow conditions, impacting industrial and biological processes.
Recently, Walkama \textit{et al.} [Phys. Rev. Lett. \textbf{124}, 164501
(2020)] have shown that geometric disorder greatly suppresses such chaotic
dynamics. We demonstrate experimentally that geometric disorder \textit{per se}
is not the reason for this suppression, and that disorder can also promote
choatic fluctuations, given a slightly modified initial condition. The results
are explained by the effect of disorder on the occurrence of stagnation points
exposed to the flow field, which depends on the initially ordered geometric
configuration.
