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

If a prop is passed to a partial Markdown file, then the ToC displays {props.propname}, instead of the actual value.

As @slorber pointed out in #9684, this is a known limitaion that stems from that even in non-partial files headings don't support expressions.
While having expressions in non-partial headings is a feature, that would be nice for completeness, it's probably not too practical. On the other hand, having expressions in headings of partials can be very useful.

Reproducible demo

No response

Steps to reproduce

1. Create a partial file that uses a prop in a heading
2. Import that file
3. Use the partial

Expected behavior

The ToC shows the value passed to the partial

Actual behavior

The ToC shows {props.propname}

Your environment

No response

Self-service

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