I noticed my audio clips with Enhanced Speech were not exporting correctly via Media Encoder. The Enhanced Speech associated with the clip did not get exported with it.
However I tried exporting the same clips directly from Premiere and the Enhanced Speech associated with each clip worked correctly.
System info
Application: Premiere Pro (Beta) v24.1.0.32
OS: macOS v12.6.9, RAM: 40.00 GB GB, CPUs (logical): 12