Presentation that demonstrates the behaviour. Please see my comment
Test File.odp (application/vnd.oasis.opendocument.presentation), 1.07 MB, created by Alexander Karner on 2012-09-25 13:16:09 UTC
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Creator: Alexander Karner
Created: 2012-09-25 13:16:09 UTC
Size: 1.07 MB

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Attachments on bug 30583: 67683