Voiceover may announce, "System Preferences has new window," when navigating certain preference panes

When navigating certain panes in System Preferences, such as Security and Privacy, startup disk and others, Voiceover may announce, "System Preferences has new window." The window chooser shows a window named, "Untitled," in addition to the main preference window. The function of this window is not known and does not appear to be navigable with Voiceover.