Fix bugs in lazily loading source-maps
Fix bugs in lazily loading source-maps

Fix bugs introduced with https://github.com/mfikes/planck/commit/97f1a0f47eb3b2f17a5c62ad9e74396566def0e8
mfikes/planck,mfikes/planck,mfikes/planck,mfikes/planck,mfikes/planck,mfikes/planck