Different routers for each tab

I'm writing a mobile app. Each tab should have its own navigation stack, i.e. you can navigate in the "News" tab, switch to the about tab and hit "About", and switch back to the News tab, leaving off right where you were, in both scroll position and path. In my app, I'm using version 1.1.2 of @modus/ionic-vue, as it does not require a router for tabs. The way I have this working is that each tab has its own VueRouter running in abstract mode. This shouldn't be possible in other navigation modes, as going back should not change tabs. Other apps, such as the ionic-vue-conference-app, try to implement this, but fail badly. Other than being broken by using relative paths, switching between tabs doesn't retain the previous navigated path. This is a key feature in many apps, and is holding me back to this old version. See this demo of what I currently have, which is what I want. What is the proper way to do this?

Start by reviewing the @modus/ionic-vue 1.1.2 tab-navigation setup and the VueRouter abstract-mode approach described in the issue. Compare it with the linked ionic-vue-conference-app and its relative-path behavior; done means each tab preserves its navigation path and scroll position without back navigation changing tabs.