  We study the effect of quantum corrections on heterotic compactifications on
elliptic fibrations away from the stable degeneration limit, elaborating on a
recent observation by Malmendier and Morrison. We show that already for the
simplest non-trivial elliptic fibration the effect is quite dramatic: the $I_1$
degeneration with trivial gauge background dynamically splits into two T-fects
with monodromy around each T-fect being (conjugate to) T-duality along one of
the legs of the $T^2$. This implies that almost every elliptic heterotic
compactification becomes a non-geometric T-fold away from the stable
degeneration limit. We also point out a subtlety due to this non-geometric
splitting at finite fiber size. It arises when determining, via
heterotic/F-theory duality, the SCFTs associated to a small number of pointlike
instantons probing heterotic ADE singularities. Along the way we resolve
various puzzles in the literature.
