Steps to reproduce:
1. Create a timeline with dialogue and music clips, tag the audio accordlingly
2. Select music clips, enable ducking, and generate keyframes
Result: Button is greyed out and says "generating keyframes." progress panels shows that progress has started, but never gets passed 0%. Waited for 30 minutes on a 10 second clip with no progress.
Expected: Audio dcking to work as normal
System info
Application: Premiere Pro (Beta) v24.3.0.38
OS: Windows v10.0.19045, RAM: 63.88 GB GB, CPUs (logical): 48
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