diff --git a/packages/llm/plugin-package-inventory-deepseek/tests/inventory.spec.ts b/packages/llm/plugin-package-inventory-deepseek/tests/inventory.spec.ts
index 6c3bb1f6db..8ffd85d6d6 100644
--- a/packages/llm/plugin-package-inventory-deepseek/tests/inventory.spec.ts
+++ b/packages/llm/plugin-package-inventory-deepseek/tests/inventory.spec.ts
@@ -103,7 +103,12 @@ describe('DeepSeek plugin package inventory', () => {
     const versioned = await packagePlugin(root, 'versioned', { name: 'same', version: 'undefined' })
     const unversioned = await packagePlugin(root, 'unversioned', { name: 'same' })
     const entries = reversed ? [unversioned, versioned] : [versioned, unversioned]
-    for (const name of [...entries, ...entries]) await ctx.loader.create({ name })
+    // Canonical array-index IDs precede other keys in Loader's object-backed store.
+    // Named IDs preserve both requested arrival orders before inventory sorting.
+    await ctx.loader.root.update([...entries, ...entries].map((name, index) => ({
+      id: `inventory-${String(index)}`,
+      name,
+    })))
     const prepared = await ctx.deepseekLlmApiExtensions.prepare({ body: { messages: [] }, signal: SIGNAL })
     expect(prepared.fields.dsh_plugin_packages?.packages).toStrictEqual([
       { name: 'same' },