Some Draw document lost images.

I followed this procedure :

1. Open a new draw.
2. Copy/paste (with Xfce on Debian) A4 (2448x3475 pixels) sized images in Draw. One image per pages.
3. Copy until 72 images so 72 pages.
4. While editing, the backup file is saving some times.
Note that some images are reflected with LO to 180° rotation.
5. When I review the file from 72th pages to the first, I noted that some images are disappeared and are now blank. The image frame is visible but not the content. Only the twenty last pages have a visible image content.
6. I saved the file.
7. I reopened. The images are still invisible as a missing link (but they are not linked only embedded in the file.
8. I extracted the file with unzip. I remarked that only the 20 last images are present. The others images are lost. 

I had noted this issue some months ago but I had not write a report.

Perhaps memory managing problem with LO ?
Perhaps, this bug is a variant of #74703.

I created a new Draw document with this picture on each pages (A4) :
http://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Penguin_in_Antarctica_jumping_out_of_the_water.jpg/1280px-Penguin_in_Antarctica_jumping_out_of_the_water.jpg

About 60 pages created, I saw that some icons of LO was changing and became green with other garbage. When I put the mouse cursor over, these icons are refreshing. Yet memory managing problems ?

But with this last file, none images are lost.