When I dupplicate a project which has background images, the dupplicated project replace the background-image by the placeholder example-bg.png. The original image is still available in the assets.
I tried this with an existing project, and then I tried it with a new project (with nothing else in it than a div with a bakground image with background-size: cover) and I had the same result.
Hope you’ll track the bug soon cause I really need to dupplicate my project.
Here is my site Read-Only for the dupplicated site:
Here is my site Read-Only for the original site: