If an item contains unicode and a dynamic page uses this for it's path to a single item, the unicode char becomes a part of the URL. This works OK in browser, but if you copy and paste that link for instance in Google Maps MyMaps on a Point that you created and paste the link, the URL is cut off just before the unicode char and thus makes the page inaccesible.
Item Name : Cádiz
URL for dynamic page: www.myserver.com/CollectionName/cádiz
In Google maps : www.myserver.com/CollectionName/c
I don´t know who is at fault here (Wix or Google), I do not know the unicode RFC specs.
Oh, and Google does not allow you to change the URL by hand.