SonarQube 4.5.4 "This block is duplicated by the resource that was deleted"

Question

While looking at my problems with SonarQube, I found a Duplicate Block that was marked as "This block was duplicated by a resource that was deleted."

Why is this block still marked as duplicated when the duplicated resource was deleted (I can’t even understand which component the duplicated code was in earlier)?

Edit @Thomas: I have the same error and this happened when the module was renamed. moduleA2(i.e., the SonarQube subproject) has all of its code "duplicated" on moduleA1, which itself is under its previous name.