Committing page properties after aborting it previously creates incorrect hierarchy

Steps to reproduce

1. Open pages app and click Add page action
2. Fill page name a and select a page template (with a page properties dialog)
3. Click next to open page properties dialog
4. Click cancel to close the dialog
5. Repeat Steps 1-3 (but set page name as b), and then click Commit.

Expected results

 
Page b to be created at root level in tree view 

Actual results

Page a/b is instead created

Development notes

This issue stems from ValueContext still containing the Wrapped Page Node in step 5 to maintain page state across requests. As a result of which the new page created incorrectly uses the page from the aborted create properties dialog as parent.