Collection Display map background-image doesn't work

• Type: Bug
• Status: Open
• Resolution: Unresolved
• Affects Version/s: 7.3.5 CE GA6
• Fix Version/s: None
• Component/s: Out of the box Fragments > Collection Display Fragment
• Labels:
  • 7.3.x-only

1. Create Blog entry with cover-image
2. Create Dynamic Collection with "Blog Entries" in it
3. Create Fragment Page
4. Add Collection Display
5. Select the created collection with the blog entries
6. Add a Container
7. Go to styles of the Container and select at the attribute "Image Source" Content Mapping
8. Select the cover-image

Actual result: Background isn't shown

Expected result: Image is shown as a background

 

Additional infos:

• If I switch the tab from "Styles" to "Link" and back the "Image Source"-attribut is resetted.
• Mapping the image to a normal image in the collection display works.
• I attached a video with the steps 4-8 and how it works with a normal image