When writing an initial basic UI test for the google sitemap app, I stumbled over this issue.
It's always happening when one is deleting a folder that contains a google sitemap. E.g. run GoogleSitemapAppUITest#verifyBasicCreateReadUpdateDelete until line #90.

The result is as follows:

• the child (the sitemap) is no longer displayed as being contained in the folder
• the action bar is not properly updated (e.g. no "Publish deletion" action)
• when unselecting/re-selecting e.g. the folder the action bar gets updated but the i18n-title of the action bar is now no longer resolved