Version

2.6.10

Reproduction link

• Functional components: https://github.com/sin1ght/test
• Regular components and slots: https://codesandbox.io/embed/vue-template-3pnsx

Steps to reproduce

After npm run serve, click the toggle button and find that child has no style.

Child and child2 components are reused, child's data-v-* disappears, causing the style to disappear

What is expected?

Child should have a black background scope style

What is actually happening?

Child without style