That's the question of course. Is it a bug.
It doesn't matter, though. Since the user has to contact Product Support
Services so PSS can try to resolve the issue for the customer. That can
mean advising the user that it is a known problem or escalating to Microsoft
Research. MR in turn can provide a fix or workaround or triage it as a bug
to be addressed in a later release, including a future version of Windows.
In any case, once the software is in production there is no means for others
to validate or vote on a bug or do anything else you normally see in a beta
program. It serves little purpose for others to replicate the bug except in
trying to help the user resolve his issue.
