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SUMMARY
Frames of scenes disappear after order moved


STEPS TO REPRODUCE
1.  create three differents scenes in the story board docker.
2. take one and move it before or after an other one.
3. The preview images of the docker disappear (but you can still work on it)
4. save and close the file.
5. reopen it.

OBSERVED RESULT

step 3 : Images preview of the docker disappear. 
step 5 :  error message when opening the file.
The images who disappeared from the preview in the storyBoard docker are now empty.
If you've created new scene between the steps 3 and 4, thoses scene are still ok.

EXPECTED RESULT
expected to not losing images when saving the file ^^

SOFTWARE/OS VERSIONS
Windows: 10
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION