I've found a nasty behavior. Consider an odt file with
on opening OO gives you "corrupted file" warning but fix it.
in odf file with
on OO give you a "corrupted file" warning and fix only the first image.
I dug in with a xml explorer the original and fixed content.xml and found out that the original have the images in a text tag
while the fixed has all the images out of text tag and listed as siblings.