Visit https://en.wikipedia.org/wiki/Oliver_Selfridge and hover over NSA (or see the following screenshot). An error message is displayed.
Hover over any other link, for example, the "Lincoln Laboratory" and the popup shows a snippet of information about that page (see the below screenshot).
*Expected*: Link to NSA should not show an error message. It should show an intro from the NSA page. (The issue is probably related to redirects.)