@@ -0,0 +1,10 @@
+---
+'@objectstack/cli': patch
+---
+
+fix(cli): i18n coverage reads a two-script inline label map the way the renderer does
+
+Clause-②: no
+Metadata-protocol: none
+
+For an inline locale map that carries both Chinese scripts, the text the coverage report reads for a reader locale now equals what the renderer shows: a `zh-Hant` reader of `{ en, 'zh-CN', 'zh-TW' }` is read from `zh-TW`, not from the first `zh-*` key. Every other map and language reads as before.
@@ -0,0 +1,12 @@
+---
+'@object-ui/i18n': patch
+---
+
+fix(i18n): a Traditional Chinese session reads and edits the Traditional entry of an inline label map
+
+Clause-②: no
+Metadata-protocol: none
+
+`pickLocalized`, `setLocalized` and `clearLocalized` now prefer an entry of the session's own script where the platform locale table splits a language by script. In a `zh-Hant` (or `zh-TW`, `zh-HK`) session, a label written as `{ en: 'Customer', 'zh-CN': '客户', 'zh-TW': '客戶' }` shows `客戶` and an edit replaces the `zh-TW` entry; before, both took the first `zh-*` key in authoring order, so a Traditional session showed the Simplified text and an edit overwrote it. A `zh-Hans`, `zh-CN` or bare `zh` session prefers the Simplified entry the same way.
+
+Which tag a key means comes from `platformLocaleTagOf` in `@objectstack/spec/system`, and the preference applies only to a language the table names more than once (`zh` today). A map without an entry of the session's script, and every other language, resolve exactly as before. What an author can write is unchanged.
@@ -0,0 +1,10 @@
+---
+'@objectstack/spec': patch
+---
+
+fix(spec): `resolveI18nLabel` prefers an inline label entry of the locale's own script
+
+Clause-②: no
+Metadata-protocol: none
+
+Where the platform locale table splits a language by script (`zh-Hans`, `zh-Hant`), `resolveI18nLabel` now reads an entry of the requested locale's script before an entry of the other one: `zh-Hant`, `zh-TW` or `zh-HK` over `{ 'zh-CN': '客户', 'zh-TW': '客戶' }` answers `客戶` in any authoring order, and `zh`, `zh-CN` or `zh-Hans` answers `客户`. It used to take the first `zh-*` key. The script a key means is read from `platformLocaleTagOf`. A map without an entry of the locale's script, and every language the table names once, resolve exactly as before. This keeps the resolver limb for limb with objectui's `pickLocalized`, which takes the same change. The `InlineLocaleMapSchema` keys an author can write are unchanged.
@@ -44,6 +44,7 @@
 
 import { deepMerge } from '@objectstack/core';
 import type { TranslationBundle, TranslationData } from '@objectstack/spec/system';
+import { resolveI18nLabel } from '@objectstack/spec/ui';
 import { collectExpectedEntries, type ExpectedEntry } from './i18n-bundle-extract.js';
 
 export type CoverageSeverity = 'error' | 'warning';
@@ -518,15 +519,16 @@ function collectExpectedKeys(config: any): ExpectedKey[] {
  * as covered the moment a map exists, which is the mirror image of the bug
  * this function was added to fix: one answer standing for two opposite facts.
  *
- * So only the **tag-matching** limbs count as coverage, in the reference's own
- * order and with its own case rules:
- *
- *   1. the exact tag — `zh-CN` reads the key `zh-CN`;
- *   2. the base language — `zh-CN` reads the key `zh`;
- *   3. the first region-qualified sibling sharing that base — `zh` reads
- *      `zh-CN`; `zh-TW` reads `zh-CN` too. Same language, other region: what
- *      the renderer really shows, and a translation into the language asked
- *      for.
+ * So only the **tag-matching** limbs count as coverage: the entries whose
+ * language subtag is the locale's (the exact tag, the bare language, a
+ * region-qualified sibling). Which of them the reader sees is asked of
+ * `resolveI18nLabel` itself, over the map cut down to those entries, so this
+ * function keeps no copy of the resolver's limb order: `zh-CN` reads `zh-CN`,
+ * else `zh`; `zh` reads `zh-CN`; `zh-TW` reads `zh-CN` when the map has no
+ * Traditional entry, and `zh-TW` over `zh-CN` when it has both (the script
+ * preference where the platform table splits a language). Same language,
+ * other region: what the renderer really shows, and a translation into the
+ * language asked for.
  *
  * The fallback limbs are excluded because falling back **is** what an
  * untranslated locale looks like: a `ja-JP` reader shown the `en` entry is
@@ -536,7 +538,8 @@ function collectExpectedKeys(config: any): ExpectedKey[] {
  * `i18n-label-resolver.ts` is the authority on the limb rule and on the case
  * asymmetry mirrored here (region case is irrelevant because limb 3 compares
  * language subtags only; language case is significant, because the reference
- * folds neither side). `inline-locale-coverage-parity.test.ts` pins this
+ * folds neither side). The describe block "coverage reads the map the way the
+ * renderer does" in `test/i18n-inline-locale-map-coverage.test.ts` pins this
  * function against `resolveI18nLabel`: whenever this says "covered", the
  * renderer really shows that entry.
  *
@@ -555,18 +558,14 @@ export function inlineLocaleText(
     return typeof value === 'string' && value.length > 0 ? value : undefined;
   };
   const tag = (locale || 'en').trim();
-  const exact = read(tag);
-  if (exact !== undefined) return exact;
   const base = tag.split('-')[0];
-  const baseHit = read(base);
-  if (baseHit !== undefined) return baseHit;
+  const sameLanguage: Record<string, string> = {};
   for (const key of Object.keys(map)) {
-    if (key.split('-')[0] === base) {
-      const sibling = read(key);
-      if (sibling !== undefined) return sibling;
-    }
+    const value = read(key);
+    if (value !== undefined && key.split('-')[0] === base) sameLanguage[key] = value;
   }
-  return undefined;
+  if (Object.keys(sameLanguage).length === 0) return undefined;
+  return resolveI18nLabel(sameLanguage, tag);
 }
 
 /**
 
@@ -272,8 +272,13 @@ describe('coverage reads the map the way the renderer does', () => {
     { 'zh-CN': '成员' },
     { default: 'Members', 'zh-CN': '成员' },
     { en: 'Members' },
+    // Both Chinese scripts, in either authoring order (#30910): the renderer
+    // reads the entry of the reader's own script, and so does coverage.
+    { en: 'Members', 'zh-CN': '成员', 'zh-TW': '成員' },
+    { en: 'Members', 'zh-TW': '成員', 'zh-CN': '成员' },
+    { en: 'Members', zh: '成员', 'zh-Hant': '成員' },
   ];
-  const locales = ['en', 'zh', 'zh-CN', 'zh-TW', 'ja-JP', 'es-ES'];
+  const locales = ['en', 'zh', 'zh-CN', 'zh-TW', 'zh-Hans', 'zh-Hant', 'zh-HK', 'ja-JP', 'es-ES'];
 
   it('a covered locale is the entry the renderer picks', () => {
     for (const map of maps) {
@@ -300,4 +305,11 @@ describe('coverage reads the map the way the renderer does', () => {
     expect(inlineLocaleText({ 'zh-CN': '成员' }, 'zh-TW')).toBe('成员');
     expect(inlineLocaleText({ zh: '成员' }, 'zh-CN')).toBe('成员');
   });
+
+  it("a map with both Chinese scripts covers each reader with its own script's entry (#30910)", () => {
+    expect(inlineLocaleText({ 'zh-CN': '成员', 'zh-TW': '成員' }, 'zh-Hant')).toBe('成員');
+    expect(inlineLocaleText({ 'zh-TW': '成員', 'zh-CN': '成员' }, 'zh')).toBe('成员');
+    // An empty entry of the reader's script is no translation: the other script still covers.
+    expect(inlineLocaleText({ 'zh-CN': '成员', 'zh-TW': '' }, 'zh-Hant')).toBe('成员');
+  });
 });
@@ -14,13 +14,12 @@
  * ## How the expectations were derived
  *
  * `pickLocalizedReference` below is a VERBATIM copy of the reference
- * implementation, taken from
+ * implementation (with its two private helpers), taken from
  *
- *   repo   objectstack-ai/objectui
- *   path   packages/i18n/src/pickLocalized.ts
- *   rev    origin/main d8d0d665dceba53dada4994f1eeef9f83bf1cf91
- *   blob   30fcb0a86343b9b937432a1b2ea89e0a78321f46
- *   last touched by objectui PR #4359 / objectui#3907 (2026-08-11)
+ *   repo   objectstack-ai/objectstack
+ *   path   ui/packages/i18n/src/pickLocalized.ts
+ *   blob   37b88c07aebfca42ce375c1e5b653f8ea26765c8
+ *   last touched by #30910 (the script-preference limb)
  *
  * Copied rather than imported because `@objectstack/spec` must not take a
  * workspace dependency on objectui — spec sits UNDER objectui in the dependency
@@ -48,11 +47,37 @@
 import { describe, it, expect } from 'vitest';
 import { resolveI18nLabel } from './i18n-label-resolver';
 import type { I18nLabel } from './i18n.zod';
+import { PLATFORM_LOCALE_TAGS, platformLocaleTagOf } from '../system/platform-locales';
 
 // ---------------------------------------------------------------------------
 // The reference implementation — verbatim, see the header for provenance. Only
-// the NAME differs, so that a reader of a failing assertion can tell at a glance
-// which side is the copy.
+// the NAMES differ (a `Reference` suffix), so that a reader of a failing
+// assertion can tell at a glance which side is the copy.
+function splitScriptTagOfReference(lang: string): string | undefined {
+  const tag = platformLocaleTagOf(lang);
+  if (tag === undefined) return undefined;
+  const base = tag.split('-')[0];
+  return PLATFORM_LOCALE_TAGS.filter((t) => t.split('-')[0] === base).length > 1 ? tag : undefined;
+}
+
+function localizedEntryKeyReference(
+  lang: string,
+  usable: (key: string) => boolean,
+  keys: readonly string[],
+): string | undefined {
+  if (usable(lang)) return lang;
+  const base = lang.split('-')[0];
+  const siblings = keys.filter((k) => k.split('-')[0] === base && usable(k));
+  const script = splitScriptTagOfReference(lang);
+  if (script !== undefined) {
+    if (usable(base) && platformLocaleTagOf(base) === script) return base;
+    const sameScript = siblings.find((k) => platformLocaleTagOf(k) === script);
+    if (sameScript !== undefined) return sameScript;
+  }
+  if (usable(base)) return base;
+  return siblings[0];
+}
+
 function pickLocalizedReference(value: unknown, language: string | undefined | null): string {
   if (value == null) return '';
   if (typeof value === 'string') return value;
@@ -67,14 +92,11 @@ function pickLocalizedReference(value: unknown, language: string | undefined | n
       return typeof entry === 'string' ? entry : undefined;
     };
     const lang = (language || 'en').trim();
-    const base = lang.split('-')[0];
     // Runtime language is often a bare base code ('zh') while metadata authors
-    // write full BCP-47 tags ('zh-CN') — upgrade to any key sharing the base.
-    const regional = Object.keys(o).find((k) => k.split('-')[0] === base && readReference(k) !== undefined);
+    // write full BCP-47 tags ('zh-CN') — upgrade to a key sharing the base.
+    const entry = localizedEntryKeyReference(lang, (k) => readReference(k) !== undefined, Object.keys(o));
     const pick =
-      readReference(lang) ??
-      readReference(base) ??
-      (regional !== undefined ? readReference(regional) : undefined) ??
+      (entry !== undefined ? readReference(entry) : undefined) ??
       readReference('default') ??
       readReference('en') ??
       Object.values(o).find((v): v is string => typeof v === 'string');
@@ -123,10 +145,62 @@ const PARITY_VECTORS: readonly ParityVector[] = [
   { limb: '3 base key wins over the region upgrade', label: { zh: '基础', 'zh-CN': '区域' }, locale: 'zh', pick: '基础' },
   {
     limb: '3 first sibling in key order wins, not the "best" region',
+    label: { 'pt-PT': 'Proprietário (PT)', 'pt-BR': 'Proprietário' },
+    locale: 'pt',
+    pick: 'Proprietário (PT)',
+  },
+  {
+    limb: '3 first sibling in key order wins for a language the table names once (es-ES aliases es)',
+    label: { 'es-MX': 'Propietario (MX)', 'es-ES': 'Propietario' },
+    locale: 'es',
+    pick: 'Propietario (MX)',
+  },
+
+  // Limbs 2–3, script first (#30910) — where the platform table splits the
+  // language by script (`zh-Hans`, `zh-Hant`), an entry of the locale's own
+  // script wins over the other script, whatever the authoring order.
+  {
+    limb: '2–3 bare zh means zh-Hans: the Simplified sibling wins over an earlier Traditional one',
     label: { 'zh-TW': '擁有者', 'zh-CN': '负责人' },
     locale: 'zh',
+    pick: '负责人',
+  },
+  {
+    limb: '2–3 zh-Hant reads zh-TW over an earlier zh-CN',
+    label: { en: 'Owner', 'zh-CN': '负责人', 'zh-TW': '擁有者' },
+    locale: 'zh-Hant',
     pick: '擁有者',
   },
+  {
+    limb: '2–3 zh-HK reads zh-Hant over an earlier zh-Hans',
+    label: { en: 'Owner', 'zh-Hans': '负责人', 'zh-Hant': '擁有者' },
+    locale: 'zh-HK',
+    pick: '擁有者',
+  },
+  {
+    limb: '2–3 zh-TW skips a bare zh key (it means zh-Hans) for zh-Hant',
+    label: { zh: '负责人', 'zh-Hant': '擁有者' },
+    locale: 'zh-TW',
+    pick: '擁有者',
+  },
+  {
+    limb: '2–3 zh-CN keeps the bare zh key when it means the same script',
+    label: { 'zh-Hans': '简体', zh: '负责人' },
+    locale: 'zh-CN',
+    pick: '负责人',
+  },
+  {
+    limb: '2–3 no entry of the locale\'s script ⇒ the old limbs answer',
+    label: { en: 'Owner', 'zh-CN': '负责人' },
+    locale: 'zh-Hant',
+    pick: '负责人',
+  },
+  {
+    limb: '2–3 a script-subtag spelling the alias table does not name is not guessed at',
+    label: { 'zh-CN': '负责人', 'zh-Hant-US': '擁有者' },
+    locale: 'zh-Hant',
+    pick: '负责人',
+  },
   {
     limb: '3 runs BEFORE default — a wrong-region hit beats the untagged entry',
     label: { default: 'Owner', 'fr-FR': 'Propriétaire' },