  We elaborate on the proposal of [Phys. Rev. Lett. 123 (2019) 13, 131302],
about the possibility of hiding the cosmological constant in the complicated
topology that one expects to exist at the Planck scale. We build a differential
equation ruling the time evolution of $\langle K\rangle$, the spatial average
of the expansion scalar. Supposing that the solution $\langle K\rangle = 0$
exists despite the presence of a large cosmological constant $\Lambda$, we show
that such solution seems to be unstable.
