Vue version

3

Link to minimal reproduction

https://sfc.vuejs.org/#eNo9kLtuwzAMRX+F5eIWqC10NZQA3foHXbikjvwIrAdEOR0E/XsoO4gm3cuLw0fG7xC6+2awR81DXEICNmkLZ3KLDT4myBDNCAXG6C00Em3IkRu84wSWJzjV+nvzY9bVw6+P6/Wt+SCn1YETkIhkbFgvyYgC0PMU/d4C5On565zzjipFK1FPf3FhS3Bvrb+a9UQoCcIDoF4ErV5o/MRj5NZeQndj72SpXPP0LDBhD7tTPVmlasI5pcC9UjwO9RQ37nyclPy6uLm0WNMZtu1f9P9sooAJK6KQK1gewYhtMA==

Steps to reproduce

Create an hgroup element.

What is expected?

No warning/error shown from Vue about custom components.

What is actually happening?

Warning "Failed to resolve component: hgroup"

System Info

No response

Any additional comments?

hgroup is an official HTML element: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/hgroup

Oops - closing: https://github.com/vuejs/core/issues/6313, https://github.com/vuejs/core/pull/6321