I am not sure whether it is a bug or or I am doing something wrong…
I have removed and reapplied a new name to the class of my collection list wrapper, but while the selector reads the correct class name the navigator displays the default “Collection List Wrapper” - not sure why…
I did notice that renaming that collection list on that page (assigning a new class name) did not change the visual appearance in the Navigator; whereas on other pages it did. So I suspect a bug. Certainly not the normal behavior. I suggest you open a ticket.