Unable to export timeline with Remixed audio

Steps to reproduce:
    1. Use the Remix feature in Premiere Pro Beta (timeline created from XML import into PP)

2. Try to export audio

 
Result: Errors, screenshots attached. I tried AIFF, WAV, QuickTime, H.264
Expected: Successful export
 
System info
    Application: Premiere Pro (Beta) v22.1.1.41
    OS: macOS v11.6.1, RAM: 64.00 GB GB, CPUs (logical): 6