I have the same problem only happening on android (my wife iphone doesn´t have this problem)
You have to be on mobile network not on wifi
I figure it out, if you have limit mobile data setting enabled it try to transcode with data coming from the server even if the show is downloaded already, so the settings prefer downloaded content have the be checked and the settings limit mobile data have to be disabled … when these 2 settings are set like this theres no more issue with playing downloaded file directly from the library (locally) and not from downloaded section
As said the ios version doesnt have this bug it play directly the downloaded file
It seems that limit mobile data settings doesn´t care if the file is already downloaded ** and still try to transcode the show **
The annoyance here is that when you’ll watch a show that isn’t downloaded it will stream at max quality by default … and so it can hurt mobile data as i have only 10gb in my plan
Also theres an other workaround i found , so you let limit mobile data enabled and still have prefer downloaded content enabled settings also
When you try to play a show that is downloaded you go to playback settings in the player then quality , you choose either quality than original, then you choose back original and voila the show is playing locally
Hope this help dev to fix this long lasting issue on android
(Btw i tried beta from playstore and it has the same issue and sorry for my english)
Edit : Edited to fix some of my english grammar and added " ** " this phrase for you to understand me better
