Img source contains [object object] #12420

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 image links are broken - the image source contains [object object]

The page url https://docusaurus.io/showcase

Reproducible demo

No response

Steps to reproduce

1. go to page - https://docusaurus.io/showcase
2. check image sources

Expected behavior

The actual, valid source url's

Actual behavior

the image source url contains [object object]

Your environment

Self-service

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