After migration list item's attachments are missing or jumbled up in SharePoint.
The attachment icons in these documents were stored in a such way that we are not able to extract these images using the Notes C API.
Workaround for migrating these types of images is to
Please note, that it is a per document setting and that is why you might see the issue with some documents and not with others.
Another workaround:
Disable "Migrate attachment icons as image files"