Error when the route bound to a functional component

[sheepzh]

Reproduction

https://play.vuejs.org/#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

Steps to reproduce the bug

1. Click the link Go to About, which is bound to a functional component
2. Click the link Go to Home
3. And then you will see this error following

4. Click the link Go to About again, this router is no longer working

Expected behavior

The router is working properly

Actual behavior

Cannot jump to any route after this happens

Additional information

No response

[posva]

Thanks for the PR. This is because they require the displayName to be set. It's now documented.