Reading comments here is clear enough that a lot of users (including me) saw the missing icons as a bug. Guidelines are good tools to give consistency, but we should also concentrate on *what* we perceive as "consistent".
A main menu with tree items, where the indentation clearly shows that something is missing on a number of menu items is just inconsistent.
To the end user the theory of item and non-item menu object is just a technical aspect, what he/she can see is an inconsistent looking menu.
Reading comments here is clear enough that a lot of users (including me) saw the missing icons as a bug. Guidelines are good tools to give consistency, but we should also concentrate on *what* we perceive as "consistent".
A main menu with tree items, where the indentation clearly shows that something is missing on a number of menu items is just inconsistent.
To the end user the theory of item and non-item menu object is just a technical aspect, what he/she can see is an inconsistent looking menu.