Preserve query parameters when moving to next step

When the Wizard is route controlled, when I move to the `next` step, the url and state changes.

Now this is all good, but the query parameters are lost during that transition. So for example, I wanted to move from add -> confirm, and my route has:

```/basePath/add?itemId="thisisanid"```

when I move to the `next` step my url becomes

```/basePath/confirm"```, when I want the url to preserve the query param as
```/basePath/confirm?itemId="thisisanid"```

Is there a way to do this?

Start by tracing the route-controlled transition used when moving from the add step to the confirm step. Reproduce it with `/basePath/add?itemId="thisisanid"` and inspect how the next-step URL is built. Done means the query parameters remain present after the transition, including in the resulting URL and state.

Written by the indexing model from the issue text.