caption_url shows up empty is API response

I'm creating videos using Heygen API in a python script. The caption_url comes up empty after the processing is completed.

I can see the subtitles show in Heygen UI. But one thing I observed is the video processing is less than 90% while the API has already indicated the processing is complete. This is buggy behaviour.

And it happens with Heygen's default voices too and not just Elevenlabs voices referring to an earlier post

This is proving to be a blocker for my tasks. Requesting the Heygen team to look into this.