Nested routes (components) are cached by parent routes (components)

[lbwa]

Describe the bug
First-level components are cached by <keep-alive> from first-level <router-view>, including nested components matched nested routes.

To Reproduce
Steps to reproduce the behavior:

1. Go to /form/step/confirm or /form/step/success
2. Click on other routes (eg. routes from /form/step/confirm to /dashboard/analysis)
3. Click button Step form in the aside menu
4. See error: routes is default matched /form/step/info, but now nested routed is Step.1 matched component.

Expected behavior
Should matched correct nested components.

Desktop (please complete the following information):

• OS: Windows 10
• Browser chrome
• Version 69.0.3497.100

Additional context
<keep-alive> cause this bug (fix) . <keep-alive> cached all first-level matched components, including all nested components matched nested routes.