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Next.js 16 next/image changed default sizing quality behavior image request validation qualities sizes official

Visual regression or image request validation appears after upgrade with unchanged component props.

search-observedNext.jsWeb frameworkFramework semantic defaultnext16

Agent Quick Fix

Local code often type-checks under both old and new framework semantics; the failure depends on the installed framework version and current runtime defaults.

Product: Next.js
Current-contract area: Next.js 16 next/image changed default sizing/quality behavior
Likely root cause: Visual regression or image request validation appears after upgrade with unchanged component props.
Repair direction: Verifier checks behavior across multiple requests/build modes, not merely compilation. Check request count, response freshness, and render behavior over multiple calls.

Validation Status

Codex searched organically in the validation run. No no-web counterfactual is attached to this page yet.

Symptom

Visual regression or image request validation appears after upgrade with unchanged component props.

Why This Happens

Local code often type-checks under both old and new framework semantics; the failure depends on the installed framework version and current runtime defaults.

Verification

Verifier checks behavior across multiple requests/build modes, not merely compilation. Check request count, response freshness, and render behavior over multiple calls.

Common Wrong Fixes

  • Changing local code without checking the current external contract.
  • Retrying the same install, build, or API call with no version/source change.
  • Applying a broad unsafe bypass when a narrow compatibility fix is available.

Codex Search Keywords

These are the search terms observed in a neutral Codex validation run for this failure shape.

Next.js 16 next/image changed default sizing quality behavior image request validation qualities sizes official
site:nextjs.org/docs next/image qualities Next.js 16
Next.js next/image qualities configuration default quality validation
https://nextjs.org/docs/pages/api-reference/components/image
'Version History' in https://nextjs.org/docs/pages/api-reference/components/image
https://nextjs.org/docs/app/guides/upgrading/version-16

Source Trail