Through a process in which a ListBoxItem Template was duplicated in the Resources, and then Elements were moved between the old ListBoxItem and into a ListBoxItemContainer Template, what ended up happening is:

1) Accessing the ListBoxItem Template through the ContextMenu results in a broken Hierarchy in the Navigator/Stage (displaying only the Increase Button rather than also showing the Decrease Button and the Star icon)

2) Accessing the exact same ListBoxItem Template through the Style's Property's Panel gives access to the Template with all Elements present as expected.

See attached video.

Repro Steps:

1) Download and open the attached Project.

2) Attempt to access the Star (which is part of the ListBoxItem Template) through the ListBox Template Context Menu.
Observe that the Star is inaccessible in this manner.

3) Through the ContextMenu, instead, open the ListBoxItemContainer's STYLE.
This will open the Style in the Style Dummy Editor.

4) From the Properties Panel of the Style, navigate to the Templating section, and identify the 'Content Template' field, which is the exact same Template which was opened in Step 2).
5) Click on the Pencil icon to open the ContentTemplate from the Style Properties.

Observe that the hierarchy is completely different than the one observed in Step 2), and now the Star, and other Elements are accessible.

Expected Results: Accessing the same ListBoxItem Template from multiple locations provides the same Elements in the hierarchy.