v16.0.9

• Pages Router: no more missingKeyHandler false positives on locale change — appWithTranslation reuses one i18next instance, so a client-side locale change renders at least once with the destination's resources loaded but the previous language still active (the changeLanguage call runs in a layout effect). With saveMissing: true, keys absent from the previous language were reported as missing during that transitional render even though they exist in the destination locale. saveMissing is now suspended while the language handoff is pending and restored once changeLanguage completes. #2344