oh neat, TIL that it supported pass-through env values. 
In the future, this might be easier: Want to share a screenshot, but blur the thumbnails?
I wonder if the lazy-loader isn’t fetching the next batch of thumbs? It fetches 128 thumbs per request. Does it fail to load on Safari or Firefox? I actually added a “Load More…” button that should have shown if the lazy-loader failed to run. I’d also check the browser’s developer tools: if the console has any errors, can you DM or email those to me?