Hangs on Attempt to Nest Sequence with Transcribed Captions

Beta 15.2.0.8. Also replicated in release 15.0.0.

Sequence nests okay using manually created caption track.

Steps to reproduce:

1.Create sequence (1) from media clip (mine was mp4 1920x1080, 59.94fps,). 

2. Transcribe and create captions from transcription. 

3. Create another sequence (2) from same media.

4. Drag sequence 1 into sequence 2.

Result: No track header highlights, as is usual when nesting a sequence. No indication there is a problem, but can't click anywhere in PR interface. Other apps on computer work. No crash, no crash report, no log at C:\Users\<username>\AppData\Roaming\Adobe\Premiere Pro Beta\15.0\logs\

I do have UXPLogs at:

C:\Users\video\AppData\Roaming\Adobe\Premiere Pro (Beta)\Logs

C:\Users\video\AppData\Roaming\Adobe\Premiere Pro\Logs

Expected: Sequence should nest.
 
System info
    Application: Premiere Pro (Beta) v15.2.0.8
    OS: Windows v10.0.19041, RAM: 23.99 GB, CPUs (logical): 8