Version

3.0.1

Reproduction link

https://jsfiddle.net/Terrijoo/pntLxf20/

Steps to reproduce

1. open console
2. click /home
3. click Info
4. click /foo
5. look into console

What is expected?

The props still being "there" and no warning about the missing required prop.

What is actually happening?

The props are apparently removed/emptied and vue throws a warning.

It's a combination of several circumstances:

1. router-view needs to be wrapped by keep-alive
2. props needs to be required on the component
3. prop needs to be on the children, it does work on the parent:

• click /home
• click /foo
• no error/warning