[Bug] Codicon not loading for expand/collapse in 0.38.0v

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

No response

Monaco Editor Playground Code

No response

Reproduction Steps

I tried updating the version of monaco-editor from 0.22.0 to 0.38.0 and also updated the monaco-webpack-plugin to the latest version. The issue is that the codicon icon for expanding and collapsing a codeblock is not loading instead it shows a placeholder rectangle box.

I saw that in earlier version It used to use the icons but now it is using unicodes. All the places where the unicodes are being used are rendering properly like find and replace tool but only this is not working as expected.

Nextjs
Webpack 5

Attached the image for reference.

Actual (Problematic) Behavior

Instead of the codicon icon for collapse and expand the placeholder icon is rendering.

Expected Behavior

The arrow icons should render.

Additional Context

No response

Reproduce the report in a Next.js/Webpack 5 app using monaco-editor 0.38.0, then compare codicon loading and expand/collapse rendering with 0.22.0. Trace the expand/collapse icon path and webpack integration; done means the arrow icons render instead of placeholder boxes.