I have a favorite Tag including a wildcard [wpf*] in my Favorite Tags list to get all question tagged with wpf. (Currently 63,210 question)
Now when i click on a Related Tag, such as [c#] (the count behind the tag states that there are 26,324 question), the c#-Tag gets ignored and the result is still all the 63,210 questions.
The result of the tag-filtering above, should be equal to the search [wpf*] [c#] is:question