  We study the completeness of light trajectories in certain spherically
symmetric regular geometries found in Palatini theories of gravity threaded by
non-linear (electromagnetic) fields, which makes their propagation to happen
along geodesics of an effective metric. Two types of geodesic restoration
mechanisms are employed: by pushing the focal point to infinite affine
distance, thus unreachable in finite time by any sets of geodesics, or by the
presence of a defocusing surface associated to the development of a wormhole
throat. We discuss several examples of such geometries to conclude the
completeness of all such effective paths. Our results are of interest both for
the finding of singularity-free solutions and for the analysis of their optical
appearances e.g. in shadow observations.
