  Covariant models of loop quantum gravity generically imply dynamical
signature change at high density. This article presents detailed derivations
that show the fruitful interplay of this new kind of signature change with
wave-function proposals of quantum cosmology, such as the no-boundary and
tunneling proposals. In particular, instabilities of inhomogeneous
perturbations found in a Lorentzian path-integral treatment are naturally
cured. Importantly, dynamical signature change does not require Planckian
densities when off-shell instantons are relevant.
