Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

The theme inconsistently wraps the title of a doc page into <header>: Only when a synthetic title is rendered, it is being wrapped into <header>. Non-synthetic titles are not wrapped into <header>.

Relevant code:

Reproducible demo

https://codesandbox.io/s/dazzling-panini-566sqf

Steps to reproduce

Go to "Tutorial Intro" page: Title not wrapped in <header>
Go to "Tutorial - Basics" -> "Create a Page": Title is wrapped in <header>

Expected behavior

The doc title should either always, or never, be wrapped in <header>.

Actual behavior

The doc page title is wrapped in <header> depending on whether it is a synthetic title or not.

Your environment

• Docusaurus version used: 2.2.0

Self-service

• I'd be willing to fix this bug myself.