CSS renames an asset pic?

I have an asset, say, “pic.jpg” . I have used it on a page as an image.
I create a second page and use that pic as a background.
It displays properly inside Blocs.

However, when I quick-export the project, the CSS renames it to “pic-1.jpg” in the background style definition. Of course, it can’t find an image by that name, so the background does not display.
Do I need a separate image (name) in asset manager to be able to use an image more than once?

Addendum: I renamed the file, loaded it back into Asset Mgr. as a new picture and the background now displays properly after export.

Sounds like a bug.