Installation disk image fails to display background

The bug

Upon opening the minecraft.dmg file, a disk image is mounted. This contains the Minecraft application, as well as an alias to the Applications folder. The contents of the disk image should be shown on top of a background, as shown below:

However, this is not shown correctly, and the contents appear to be placed as if they are just in a regular folder:

How to test

1. Download Minecraft for macOS from the link: https://launcher.mojang.com/download/Minecraft.dmg
2. Run the file
   Notice how the files within the disk are shown as if they have been placed in a standard folder (no background)
3. Press Command + Shift + . to reveal hidden folders
4. Navigate to the .background folder
   Observe how the background.png file is present