You can clone with
HTTPS or Subversion.
See the attached test-case: http://gist.github.com/586055
I came across this bug in the following code: https://gist.github.com/a159097b0df22d7dde9f
which populates a treecontroller with all projects from another controller.
This behavior isn't present in e.g ArrayController, but I haven't been able to track the bug down.
This appears to be present in 1.0.1046, master and quilmes.