Subtitles from transcript = infinite loading

Steps to reproduce:
    1. I use the auto-transcription feature (in french)
    2. then I try to create subtitles from the transcript
 
Result: The loader circle appears. The process never ends (infinite loading)
 
System info
    Application: Premiere Pro (Beta) v15.2.0.29
    OS: macOS v10.16.0, RAM: 32.00 GB, CPUs (logical): 8