No matter what I do, I cannot get the built in LG Plex app on my B9 to play DD+ audio

Hello all, I am currently on an LG B9 that is connected directly to my Denon S540BT via arc using a premium 8K HDMI cable. No matter what settings I’ve tried I cannot get Plex to play DD+ audio. I find a movie I want to play that has EAC3 audio and no matter what it shows up as “DD” on the Denon. If I go to playback stats it says “can direct stream audio: false” which I assume is the issue. If I boot up my PS4 pro and play the same movie on the plex app, no issues. Denon shows DD+ on the screen and plays fine. Does the built in LG Plex app not support DD+? Is there anything I can do to get DD+ vs just regular DD?

My LG B9 is currently set to HDMI ARC audio, passthrough. Plex audio settings have all formats checked including EAC3

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