Scarab Diagnostic Suite Field Test #012: Next.js Source Map Provenance Boundary

This field test was against Next.js.

The issue was Next.js #94450:

https://github.com/vercel/next.js/issues/94450

The reported problem involved production browser source maps when React Compiler and Turbopack were involved.

The visible symptom was that the final browser source map could expose transformed compiler output instead of preserving the original client source content.