Bug: Different Transcripts on "Update available" preview

[ChrisChV]

Steps to reproduce

• Create a library video with one or more transcripts (here, I used your mp4 video link, but it happens with the imported transcripts from the example youtube video too).
• Publish the library video.
• Copy it to the clipboard.
• Paste into a course. Note that the transcripts are displaying fine here
• Re-edit the library video, and replace a transcript. Wait for it to process fully before hitting Save.
• Publish the library video again.
• Return to the course LibraryBlock, and refresh to see the "updates available" button. Click it. Bug: the downstream (course) video preview shows the updated English transcript from upstream, not the actual transcript that's on the downstream block.
• Accept changes.

Transcripts.sync.bug.mp4