diff --git a/assets/admin/src/schema/sections/users/badge.js b/assets/admin/src/schema/sections/users/badge.js
index 0e5c8b3b..2e8c476c 100644
--- a/assets/admin/src/schema/sections/users/badge.js
+++ b/assets/admin/src/schema/sections/users/badge.js
@@ -134,6 +134,7 @@ export const badgeSchema = {
           key: 'user_medal_args',
           label: '分类与条目',
           type: 'json',
+          sanitizeType: 'array',
           default: defaultMedalArgs(),
           help: '由自定义页编辑：分类 → 条目（slug/名称/描述/图标/get_type/get_val）。仅手动授予用 manually_add。',
           dependsOn: { key: 'user_medal_s', value: true },
diff --git a/src/Admin/Schema/SchemaUsers.php b/src/Admin/Schema/SchemaUsers.php
index 2a8e9eaa..4fecd3ec 100644
--- a/src/Admin/Schema/SchemaUsers.php
+++ b/src/Admin/Schema/SchemaUsers.php
@@ -557,6 +557,10 @@ class SchemaUsers {
                                 'key'     => 'user_medal_args',
                                 'label'   => '分类与条目',
                                 'type'    => 'json',
+                                // Must be explicit: sanitize_field_value() only honours sanitize_type
+                                // on the write path. Without it the nested catalog is cast to the
+                                // literal string "Array", wiping every badge from the dictionary.
+                                'sanitize_type' => 'array',
                                 'default' => self::default_medal_args(),
                                 'help' => '结构化目录：分类 → 条目（slug/name/desc/icon/get_type/get_val）。由 SPA UsersBadge 编辑。',
                             ],
diff --git a/src/Admin/SchemaProvider.php b/src/Admin/SchemaProvider.php
index 7f209c4f..6da9b49a 100644
--- a/src/Admin/SchemaProvider.php
+++ b/src/Admin/SchemaProvider.php
@@ -857,6 +857,13 @@ class SchemaProvider {
 			return esc_url_raw((string) $value);
 		}
 
+		// Structured container types must never reach the scalar fallback below:
+		// casting a nested payload to string silently destroys it ("Array") and
+		// validate() has no json/array shape check to catch the loss.
+		if (in_array($type, ['json', 'repeater', 'sortable', 'group', 'fieldset', 'accordion'], true)) {
+			return is_array($value) ? $value : [];
+		}
+
 		return sanitize_text_field((string) $value);
 	}