Widget option Display contextual content does not work as expected

Some widgets have options like this:

Display contextual content
If selected, the widget will display content which pertains to the location the widget appears in. For example, if the widget appears within a forum, it will only display threads from that forum.
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The example suggests that the widget will use the forum context if it is displayed somewhere on a forum page.
But this only works for widget locations within forum_view, it does not work if the widget is...

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