Deactivating the option "Show question title" within a test there's only an effect in the question view not in the structure of the questions on the left.
As this is possibly not really a bug, the option should be named 'Show question title within question' or question title in menu should be "anonymized" somehow. Perhaps just counting "Question 1...n"
Question1 ... n in the navigation on the left as well as in the title.
In a new section, start with question 1 again