Page excluded from Auth can be open in Web preview but if a page has params handed over in page call then it doesn't work. If you pass auth then it works fine. This bug is only visible in web preview. Android and IOS preview in app works as expected.
How to recreate the problem:
+ Create an app
+ Add authentication
+ Turn on "Allow page to be opened without authentication"
+ Open this page in web preview. It will work.
+ Add params to this page and call this page with params. It won't work.
It will only gets open (page with params) if you pass authentication. IOS/Android preview app works fine.