I have created a bugreport: https://bugzilla.redhat.com/show_bug.cgi?id=971100 and used the 'Possible Duplicates' function to check for already existing reports. There has been a bug: https://bugzilla.redhat.com/show_bug.cgi?id=891044 which was not displayed in this view, even if it's a clear duplicate. It has the same component and even a similar title. It would be great if duplicates like these would be shown, too.
Bugzilla only checks for the title of the bug and in this case, both bugs just share the string "1.1.0", that is 5 characters, while 19 are different. I doubt one can write a matching logic for that and not overload the server with database queries. Anyway, as this is hardly a bug but a feature request and not specific to Red Hat's bugzilla instance, I suggest you file a report upstream.
Filed upstream