Indeed, I lost the history in a shuffle, but a similar use case broke in some Firefox update, and it's the exact reason behind this comment:

https://github.com/seligman/podcast_to_text/blob/master/sear...

In my case, loading the entire file is loading a tiny bit more data, so this fallback doesn't hurt, but it's still annoying, and broke any hope I had of doing something more clever with the dataset.