No updates? I have a very similar problem, the page change animation will start and then revert back to the previous page, even though the URL has been updated. If i reload the page with a given URL the correct page is shown, i just can’t manage to switch between pages with the router.
StackOverflow question about the same issue, with no solution: routes - Ionic 4 routing not working the url changes but view doesnt appear - Stack Overflow
Solution update: in my case the solution was completelly unrelated, components weren’t able to load properly because i commented out a line in global.scss, more info in the following thread