Dynamical instability of minimal surfaces at flat singular points

Suppose that a countably $n$-rectifiable set $Gamma_0$ is the support of a multiplicity-one stationary varifold in $mathbb{R}^{n+1}$ with a point admitting a flat tangent plane $T$ of density $Q≥2$. We prove that, under a suitable assumption on the decay rate of the blow-ups of $Gamma_0$ towards $T$, there exists a non-constant Brakke flow starting with $Gamma_0$. This shows non-uniqueness of Brakke flow under these conditions, and suggests that the stability of a stationary varifold with respect to mean curvature flow may be used to exclude the presence of flat singularities.