Children pages not displayed in the Information tab

Steps to reproduce (FF3):

• Create a new page (say Main.Larvae)
• Edit the page and create a link towards a new page (Main.Butterfly)
• Save Main.Larvae and click on the wanted link to create the Main.Butterfly page
• Add content to Main.Butterfly and save it
• Look at the information tab: Main.Larvae is listed as the page's parent
• Go back to Main.Larvae
• Look at the page children under the Information tab

-> It says "no children" although Main.Butterfly should be listed there.