After renaming a BlogPost, pageManager.getById() return a Page, not a BlogPost

After renaming a BlogPost, pageManager.getById() starts to return a Page, not a BlogPost.

It only seems to happen when inside an Action. Inside a Macro, it works fine, it returns a BlogPost.

And it only seems to happen after the BlogPost is renamed. Before renaming it, it works fine, it returns a BlogPost. After the renaming, it returns a Page.

Before:

url of blogpost 'blogpost: demo page v.1 (13598761)'=/display/test/2009/08/23/demo+page

After:

url of page 'page: demo page - renamed v.2 (13598761)'=/display/test/demo+p
age+-+renamed