After saving the file and reload it, the image is not lost
Test 1 - Grouped line expanded - Image exist.ods (application/vnd.oasis.opendocument.spreadsheet), 27.40 KB, created by rh77 on 2018-03-08 09:12:18 UTC
(hide)
 
Creator: rh77
Created: 2018-03-08 09:12:18 UTC
Size: 27.40 KB

Attachment is not viewable in your browser because its MIME type (application/vnd.oasis.opendocument.spreadsheet) is not one that your browser is able to display.

Download the attachment.

Actions: View
Attachments on bug 115655: 140011 | 140464 | 140465