Not sure how to report a bug but try this scenario:
Create new page. In the list of pages make sure you scroll down a bit. Use Ctrl + tab or alt + tab to leave current window and get back. Automatically you are at the top of your list of pages.
Hmm you're right, it is a focus bug. I just tried it in the latest development branch and it appears to have been fixed already so I won't report a bug for it.