Steps:

1. Go to Content/Content structure (please notice that Home also seems to be bookmarked)
2. Click Create and choose Article
3. Fill required fields and click Publish

Actual result:

CI seems to be bookmarked, because button's icon looks like that. What's more if you click this button several times it's never off.

Expected result:

It should be possible to switch bookmark button. Default state should be "off".