Regression: Live/Preview not working in cms channel manager

When a document is edited and is not published yet, any changes are not shown in the channel manager or the preview site.

Here are the steps to reproduce the bug:

1- Go to CMS
2- Open the channel manager - english channel
3- Edit a content
4- Change the title and save the document (do not publish)
5- Go back to the channel manager
6- Here is the bug: the title is not updated

If you do the change on a news for example and you search this document,
the preview version will be displayed in the search, not in the detail view.