[pull] canary from vercel:canary#814
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pull[bot] merged 2 commits intocode:canaryfrom Feb 22, 2026
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## Summary - Fixes `route.replace is not a function` error when running `next build --debug-build-paths` on projects with parallel routes **Root cause:** Turbopack filters routes at the route level (e.g., `/parallel-test` includes all page entries), while JS route discovery filters at the file path level (e.g., only `app/parallel-test/page.tsx`). This causes the `appPathsManifest` to contain entries (like `/@sidebar/page`) that `mappedAppPages` doesn't have. The unguarded lookup at `mappedAppPages[originalPath].replace(...)` crashes on `undefined`. **Fix:** Added a guard to skip manifest entries that don't exist in `mappedAppPages`. ## Test plan - [x] Verified `next build --debug-build-paths 'app/parallel-test/**/page.tsx'` succeeds on test fixture - [x] Verified other `--debug-build-paths` patterns still work (multi-page, pages-only, etc.)
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