After page rename, the old page redirects wrongly to Main.WebHome

Steps to reproduce:
1. Create a page Page1.WebHome
2. Rename it to Main.Page1.WebHome.

The links are updated, the redirect is created and the original page is hidden.

However, as Admin, I can still see it in the Breadcrumbs and in the Page Tree macro and if I try to access it, I'm redirected to Main.WebHome.
I noticed the same behaviour while trying to access from url:
127.0.0.1:8080/xwiki/bin/view/Page1/

In the original page, the XWiki.RedirectClass object has value WebHome, while maybe it should be Main.Page1.WebHome.

This happens only when the new parent doesn't have a parent. In this case Main's parent is null.