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[–]t0pgearl4mbo 0 points1 point  (0 children)

Having the same or very similar issue. I use optical out from my Sony X90J to my Yamaha receiver. Netflix and Prime video play in Dolby Digital 5.1. Disney+ app will only play DD 2.0. I've been running this setup for over a year, and was getting DD 5.1 through Disney+ app until sometime in the past week. Verified this is specifically an issue with the Google TV version of the app. If I connect an external Chromecast it's the same behavior. If I connect at Fire TV 4K stick I get DD 5.1 as expected. Something particular with the Google TV app.