I was hoping that a tester would be found ..
.. because so many US users switched to Prime Channel because of the P+ 540p limit.
There is no (Audio related) Error in Log, only missing en Subtitle.
I tried the mpd in your Log and it offer 4x audio_en-US_4=640000

So I dl all and like the mpd all have no AD label - all show “English (US)”
(I can’t hear anything, because without access I can’t get key to decrypt)
As a result, I can’t really say whether SF is using the wrong audio
or whether the error lies with Amazon
(which would be likely if only one episode is affected).
btw: I also don’t understand why Amazon lists January 4, 2026 for s02e10