Whilst drilling down into some interdependencies, I was confused when I got to this view:

I had being following the Red > to drill down, the view before was this:

However, when I got to the view in the first image, I misunderstood the "summary" at the bottom to mean CollectionExtensions had interdependencies instead of the Application.
Some time was lost trying to figure out the reason for CollectionExtension having interdependencies, when in fact I should have opened Application to see the problem.