Samsung UE55MU7000 keeps transcoding audio to AAC and not EAC-3

Server Version#: 1.19.5.3112
Player Version#: 5.1.2
I’m running my server on Synology NAS(DS118), have Sonos Arc+2 Surrounds+Sub, so it can be called True 5.1 as i watch movies in Russian and most of the content anyway is 5.1 DTS or DTS MA.
My TV is able to play Dolby Digital+ as well as Sonos Arc, but Plex is continuing to transcode audio to aac and not eac3. If i manually transode audio using ffmpeg everything is working flawlessly, but plex keeps downmixing to 2.0 aac.
I dont need Atmos to DD+(no Atmos content at all) i just proper DTS transcoding.
I disabled Multichannel enhansment as well as DCA audio in settings.
Please help to do sth with it, cause manual conv takes a lot of time, as all my files on NAS.

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Plex cannot transcode to EAC3, only AAC or AC3 depending on your devices capabilities. Going to need logs to determine whats going on.

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