I don’t think Peacock module is broke in this situation.
I got the descriptive audio also.
Why some did get it and some did not I can not explain.
Might more likely be a Peacock or SF temp glitch.
I just did 2 things at the same time and 1 or both fixed it for when I downloaded again.
I played the episode seeing that while watching I could chose between English and English AD.
Mine was set on English, but I selected English AD, then switched back to just English.
I then followed the steps in link I gave in my second post and forced SF to analyze the specific episode.
Yes Peacock auto analyzes but following the steps still can analyze any one episode anyone wants.
I Then downloaded again and there was no descriptive audio.
So op can try either or both and if others experance this abnormality they can try them as well.
For all we know even just a simple clean of temp folder may work.
OP never came back and said if they tried anything or if just worked or really never replied in any form as to if fixed and if so what if anything was done.
I also know I did at least try, saw it happen after first download I tried of the episode, and clearly heard the descriptive audio.
Then did what I did and second attempt of a download went fine and had no descriptive audio.