Please elaborate with the help of some relevant screenshots of the specific areas with the URL of the website to check it myself and help you out accordingly.
Try it yourself. Everytime you when I writing something I get same answer.Even your documentation is not included how to use the navigation widget.
Simply create a new page in wordpress and edit elementor and add some dummy content and add navigation widget and then create a link and add the anchor #anchor1 to it. And try it.
Of course, we have already tested this functionality and it works correctly https://gyazo.com/0cfcbe4e37e3eecf449f90b210f4970f
Please, note that it is a Navigation anchor and it is developed to work with our Navigation. Make sure that you have added this menu item as shown on screenshots