So you are using page route? Are you sure page route is properly defined in the routing panel? Also are you sure the page route path is also properly defined?
Please post some screenshots.
Adding to what Mohit has shared…
The routes here are client side. Its an SPA project.
This is based on ASP.NET server model.
We have another SPA project which has PHP server model and we upgraded it to 3.3.3 after we encountered this issue in ASP project. In the PHP project, everything is still working as it was.
We have a thrid NodeJS project too, which uses the 3.3.3 NodeJS SPA and that is working fine too.
The ASP.NET project was working fine until 3.3.2. We updated that today and are now seeing this issue.