[Bug] loader.js source mapping issue when loader.config with custom source map files in 0.55.1

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

When configure loader with custom vs path like this

import Editor, { loader } from "@monaco-editor/react";

loader.config({ paths: { vs: `node_modules/monaco-editor/min/vs` } });

So during component loading, it shows error in terminal console.

7:12:31 pm [vite] (client) Failed to load source map for /home/project/node_modules/.pnpm/monaco-editor@0.55.1/node_modules/monaco-editor/min/vs/loader.js.
Error: An error occurred while trying to read the map file at ../../min-maps/vs/loader.js.map
Error: ENOENT: no such file or directory, open ' /home/project/node_modules/.pnpm/monaco-editor@0.55.1/node_modules/monaco-editor/min-maps/vs/loader.js.map'
    at async open (node:internal/fs/promises:637:25)
    at async Object.readFile (node:internal/fs/promises:1269:14)
    at async extractSourcemapFromFile (file:///var/ /home/project/node_modules/.pnpm/vite@7.3.1_@types+node@24.1.0_lightningcss@1.30.1_sass@1.77.8_terser@5.46.0/node_modules/vite/dist/node/chunks/config.js:8050:65)
    at async loadAndTransform (file:///var/ /home/projectnode_modules/.pnpm/vite@7.3.1_@types+node@24.1.0_lightningcss@1.30.1_sass@1.77.8_terser@5.46.0/node_modules/vite/dist/node/chunks/config.js:22641:22)

Monaco Editor Playground Code

Reproduction Steps

No response

Actual (Problematic) Behavior

No response

Expected Behavior

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Additional Context

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Reproduce the custom loader.config paths case and inspect node_modules/monaco-editor/min/vs/loader.js together with the referenced min-maps/vs/loader.js.map path. Check how the source map is resolved during loading, then verify that the configured loader no longer produces the missing-map error in Vite.