Audio sounds awful on export (M1 Mac Beta)

[garrettsammons]

I'm running Premiere Pro V 15.0.0 BETA (Build 25[R]) on the new M1 2020 Mac Mini running macOS Big Sur V 11.2.1.

Several native audio effects have been applied to the dialogue audio to clean it up and EQ, specifically Dynamics and Parametric Equalizer (screenshots attached). When viewing the video in Premiere, it sounds perfect. After exporting using the built-in "YouTube 1080" preset, which I've used for years, the audio is awful. It sounds muffled like the person is underwater or in the next room.

I can't figure out where the disconnect is or why the audio would be exact inside the project but can't export.