  The backreactions of anti-branes on a variety of supergravity backgrounds
have been shown in a recent series of papers to be riled by some unexplained
flux singularities. All of the situations studied so far involve backgrounds
with (close to) AdS-asymptotics. It is the purpose of this work to study the
backreaction of anti-M2 branes on a background exhibiting a different UV
behavior: The so-called $\mathbb{A}_8$ regular solution of eleven-dimensional
supergravity that we consider has "Taub-NUT type" asymptotics. As it turns out,
some subleading infrared singularities are inevitable; they cannot be naturally
ascribed to the anti-branes backreacting on this background. Moreover, our
configuration does not involve smeared branes. This lends further credence to
the work of Bena et al. suggesting that the singularities encountered are in no
way remnants of smearing that would wash away once brane polarization is taken
into account.
