Claro + layout builder messages display additional icon in top left corner

Steps to reproduce

1. Install Drupal 8.9
2. Create a block type or two
3. Enable layout builder module
4. Enable Claro theme
5. On a CT display, enable "Use Layout Builder" and click "Edit layout"
6. Add a block in a region

Current result

• Messages display an additional icon in the top left corner

Expected result

• Messages should not display any additional icon in the top left corner