New
#11
I've just come across the exact same situation and I can confirm that it is left over when you do a Move of My Documents. I have tried it several times (after repeatedly doing image restores). I assume it is something that Microsoft never addressed.
My guess is that the vast majority of folks that do such a Move are never aware of the redundant Junction. Unless they go into C:\Users\XXX (with "Hide protected operating system files" disabled) and click on the My Documents, you don't tend to come across it. And unless they run into issues with software accessing the junction via hard coded paths in software it will never become an issue.
At the moment I haven't decided whether to just leave this junction (does anything really use it?), delete it, or delete it AND create a new one pointing to D:\XXXData\Documents.