It is normal for unpublished pages to throw a 404 error - this is the default behavior in unpublished pages. This behavior has remained the same throughout the previous versions of Sitefinity.
Please let us know if you have anymore questions or concerns.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items