link active class not being applied to parent route

[autumnwoodberry]

Version

3.0.2

Reproduction link

https://codepen.io/autumnwoodberry/pen/jovEqW?editors=1010

Steps to reproduce

Use vue-router version 3.0.6. Create a parent route with 2 child routes:

/parent
/parent/child-1
/parent/child-2

Add a redirect function to the parent route that will automatically redirect to child-1.
Create a router link for all 3 routes.
Observe that when the URL is /parent/child-1 the router link to /parent has the active route css class.
Observe that when the URL is /parent/child-2 the router link to /parent does NOT have the active route css class.

In version 3.0.2 the route active class will still be on the /parent router link when the URL is /parent/child-2.

Here is the working version example: https://codepen.io/autumnwoodberry/pen/jovEqW?editors=1010
And here is the non-working version example: https://codepen.io/autumnwoodberry/pen/yWxyYJ

What is expected?

Route active class should be present on a link to a parent route when the child route is active.

What is actually happening?

The route active class is not present.

[posva]

A redirect with a component doesn't make sense, you should use an empty child with a redirect instead but then you will find this issue: #2724
I'm closing this as a duplicate of that