Not surprising. Amazon is terrible at delivering consumer apps. The Apple TV prime video app freezes often, then after they added ads, the app now actively prevents you from muting them! You can mute during an ad, but then the app will immediately turn the volume back up. It’s straight out of black mirror.
Not to mention that on all devices I used the official Prime Video app (yes, even Fire TV Sticks), there we massive audio latency issues up to the point where I stopped watching. On FireTV Netflix had also lagging behind audio, which it never did on any other platform.
I am talking about a like 1 second delay here, not 50ms (which is already not good).
Amazon doesn't care about the viewer/user experience. It is always a disaster.
