I see the same issue in 1.4, 1.5, and a recent build of master (1.6) opening the same file in MyPaint 1.0.0 is shown as it should based on the screenshots provided (all_images_on_one_screen.png)
if you unzip flower.ora you get:
data/ 000.png 001.png 002.png Thumbnails/ thumbnail.png mimetype stack.xml
I can tell you that thumbnail.png is what is used to create the Preview you see in the Open Dialog, which is why the preview works.
I see the same issue in 1.4, 1.5, and a recent build of master (1.6) on_one_ screen. png)
opening the same file in MyPaint 1.0.0 is shown as it should based on the screenshots provided (all_images_
if you unzip flower.ora you get:
data/
000.png
001.png
002.png
Thumbnails/
thumbnail.png
mimetype
stack.xml
I can tell you that thumbnail.png is what is used to create the Preview you see in the Open Dialog, which is why the preview works.