I use ionc3 with 'tabs layout', 'ionic serve', 'IonPageModule' for development, in chrome.
Although there is a url for every page, reload the browser,the state can not be saved, the first tab's root page has been actived.
If my app has many pages, this is a really serious issue.
That's actually not possible. After your modify your code and save, the live reload of Ionic behaves as if you restarted the application to take the new logical changes into account (note that .scss changes can be directly applied).
If you need to "save the state", you will need a database or use the storage.