  The loop quantization of the Schwarzschild interior region, as described by a
homogeneous anisotropic Kantowski-Sachs model, is re-examined. As several
studies of different -inequivalent- loop quantizations have shown, to date
there exists no fully satisfactory quantum theory for this model. This fact
poses challenges to the validity of some scenarios to address the black hole
information problem. Here we put forward a novel viewpoint to construct the
quantum theory that builds from some of the models available in the literature.
The final picture is a quantum theory that is both independent of any auxiliary
structure and possesses a correct low curvature limit. It represents a subtle
but non-trivial modification of the original prescription given by Ashtekar and
Bojowald. It is shown that the quantum gravitational constraint is well defined
past the singularity and that its effective dynamics possesses a bounce into an
expanding regime. The classical singularity is avoided, and a semiclassical
spacetime satisfying vacuum Einstein's equations is recovered on the "other
side" of the bounce. We argue that such metric represents the interior region
of a white-hole spacetime, but for which the corresponding "white-hole mass"
differs from the original black hole mass. Furthermore, we find that the value
of the white-hole mass is proportional to the third power of the starting black
hole mass.
