Audio auto-population

[cEFTE]

After a recent reinstall, I've run into a brick wall with the 'Fill missing card data' option.

The chinese-lessons audio is downloaded perfectly (but is missing more than a few pinyin, shou3 being the first I noticed), but the field is populated not with reference to those mp3 names but with what look like hash digests:

115b35e5f278a45be7b287e0d87c8e33.mp3

Being an example for quan2.

Which, as far as I can remember, is the reference for the older audio files that have since been updated. Is there a way to force the repopulation to be more up-to-date?