If currentTrackBundle is updated at the start of the
block and then something goes wrong in the middle (e.g.
one of the skipFully calls) then the extractor wont
resume from the correct place.
This would be caught by our extractor tests if we had
a test sample that requires skipping to the sample data.
I'll try and construct one of those.
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MOE_MIGRATED_REVID=131191174
