Current behavior 😯

Go directly to a blog through a URL, click the search button. A search dialog appears, but the icons in the search dialog appear abnormally.

Expected behavior 🤔

Steps to reproduce 🕹

Steps:

1. Go directly to a blog through a URL, such as https://master--material-ui.netlify.app/blog/aggregation-functions/
2. Click the search button in the upper right corner of the page
3. We can see the weird icons in the search dialog

Context 🔦

When I read what PRs people created, I came across a PR about fixing blue outline bug. I went directly to a blog via the provided URL, and then I clicked the search button casually.

Your environment 🌎

  Don't forget to mention which browser you used.
  Output from `npx @mui/envinfo` goes here.