The NIC has a bug

Discovered in #1235 wherein troubleshooting/bug hunting has revealed that, for some specific images, something about image edges presence (we think) cause the job to get stuck on processing and never progress to "finished" or "failed". Making a separate issue for addressing/unpacking the NIC specifically, with the debugging steps and examples describes in #1235 .

It is possible to do a full e2e run with images which have previously failed by cropping the images so that only the page being OMR'd is visible, so this is nothing blocking or breaking, but is something to keep in mind for future e2e OMR runs.