If you have the [[Hands-on universe|Hands-On Universe]] link, it will report that Hands-On universe doesn't exist (which it does). This is probably because it matches on the different case: Hands-On Universe and then stops comparing.
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=52596
(In reply to comment #1)
Other examples: [[A]], [[B]], [[To]], [[Hi]]
I filed this as bug 51013.
This also happens with redirects.
For example, [[Github]] is a redirect to [[GitHub]] but [[github]] is shown as not existing.
See attachment 13013 to bug 52251
Forgot to add that redirects that differ other than by capitalisation are shown - e.g. [[Elizabeth II of the United Kingdom]], a redirect to [[Elizabeth II]], appears in the suggestions list.
Per discussion at Bug 52596 the presence of a redirect with a title of <=3 characters /may/ prevent an article with that title (but differently capitalised) appearing in the suggestions list.
For example the existence of the [[Fra]] redirect may be what is preventing the [[FRA]] article appearing in the list (something is, and the redirect is one theory).