Latest update: Template images breaking and showing "The image cannot be displayed" red X

I had a dig inside ramoncrespo-154​ sample .story using my Media Ledger tool and found some detail that might help narrow this down.

The broken pictures haven't lost their image data. They've lost the reference to it. Four picture objects in the slide have imgSet="true" but no assetG attribute at all, and a fifth points at an all-zeros GUID. The asset list only declares seven assets (the six numbered JPGs plus tick.png), all intact with matching checksums, which is why the rest of the slide still displays fine.

One more oddity, story/media contains six files of 212 to 303 bytes each that are actually 30-pixel-wide PNGs saved with .jpg extensions. They're listed in the slide's rels but nothing in the slide XML uses them, and they're not in any asset list. So whatever happens at template import is stripping asset references from some objects and writing junk fragments where the real assets should be.