Call hierarchy only shows Incoming but not Outgoing

Call hierarchy of foo():

Incoming shows "main", and that's OK.

But foo calls bar(), so I would expect Outgoing to contain bar.

As a side note: in front of "main" there is a tree indicator that suggests that you can expand "main", but if you click on the triangle the triangle flips to expand mode but does not show any children. When the indicator is clicked a second time, the indicator is removed.