I wanted to do something similar to what is described here.
Although the mappings were correct, I was never able to navigate to a particular page. So I thought there might be an incorrect mapping.
However, the actual problem was on the page itself. Although no elements had the same name, there was a polyline element that had been preventing the page from switching.
After I deleted it, the page switch works without any problems.
PS: On a completely different note: if you reference an element of a structure to the structure itself, the PLCnext Engineer crashes.