I came across this bug by chance, but I can successfully reproduce it anywhere, including blank projects.
Steps:
- Create a blank widget
- Add a Border Widget (from Common) to the [Canvas Panel]
- Rename the border to “Background”
- Right click Background in Hierarchy and choose “Replace with Canvas Panel”
- Add an Image Widget (from Common) to the original [Canvas Panel]
- Rename the image to “Background” (notice there is no error saying that Background is already taken)
- Crash
Have not tried this in 4.8 Preview builds.