Next's fallback-metrics table has no entry for this (newer, merged variable-font) family name, so the CLS-reducing fallback override it tries to generate always fails with a build warning. Correctly suppresses it under webpack; Turbopack (this project's default builder) doesn't yet honor the flag the same way, so the warning still prints there today, but the setting is still the semantically correct declaration of intent and forward-compatible. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012hQoM3jJT1Lx7CMTciMzvD