Audio Files - "No summary available at the moment"

Steps to reproduce:
Try to summarize an audio file. The longer the better, in my experience.

I tried this two days ago:

And got:

No summary available at this moment, please try again later.

The summary is usually available ₁₀ minutes later.

Expected behavior:
The summary would just keep loading until a summary was available, then show it to me.

Debug info:
Firefox/GNU+Linux/ASIA-SOUTHEAST