  We study 4d membranes in type IIA flux compactifications of the form AdS$_4
\times X_6$, where $X_6$ admits a Calabi--Yau metric. These models feature
scale separation and D6-branes/O6-planes on three-cycles of $X_6$. When the
latter are treated as localised sources, explicit solutions to the 10d
equations of motion and Bianchi identities are known in 4d $\mathcal{N}=1$
settings, valid at first order in an expansion parameter related to the AdS$_4$
cosmological constant. We extend such solutions to a family of perturbatively
stable $\mathcal{N}=0$ vacua, and analyse their non-perturbative stability by
looking at 4d membranes. Up to the accuracy of the solution, we find that
either D4-branes or anti-D4-branes on holomorphic curves feel no force in both
$\mathcal{N} =1$ and $\mathcal{N}=0$ AdS$_4$. Differently, D8-branes wrapping
$X_6$ and with D6-branes ending on them can be superextremal 4d membranes
attracted towards the $\mathcal{N}=0$ AdS$_4$ boundary. The sources of
imbalance are the curvature of $X_6$ and the D8/D6 BIon profile, with both
comparable terms as can be checked for $X_6$ a (blown-up) toroidal orbifold. We
then show that simple $\mathcal{N}=0$ vacua with space-time filling D6-branes
are unstable against bubble nucleation, decaying to $\mathcal{N}=0$ vacua with
less D6-branes and larger Romans mass.
