Optimizing 4k titles causes Plex to freeze - TrueHD audio the problem?

Continuing to bump this in hopes of Plex staff chiming in.

I attempted to manually select a non-TrueHD audio track for a file that has TrueHD audio, then convert it after that. My understanding is that the optimization should have used the non-TrueHD audio I had selected in the web player. Unfortunately, that didn’t change the behavior.