Fix for crashing on save

converter.documentData contains the full data with metadata interleaved,
but it was being sliced using offsets relevant to the element data.

Change-Id: Iddbef23212da818a2a399b4abdc223aad130eb4e
See: I6daff5c5969e5fdc871f8f346cf790b4302ae080
Merge "Fix for crashing on save"