4bc8a3e9c714d2ccb3c0c288347c0db5e2f20073
It is not sufficient to simply drop the first source of a region. While destroying a whole-file region marks all its sources as unused, only the source for 1st channel was explicitly removed. The session accumulated <Sources>, without corresponding whole-file Regions. Those can prevent cleanup of unused sources, particularly when using snapshots.
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