Framework semantic default
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.
Agent Quick Fix
Repair against the current Next.js contract, then keep the change narrow and source-backed.
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.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.
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