@@ -0,0 +1,30 @@
+---
+'@object-ui/app-shell': patch
+---
+
+Canonicalize `reference` / `reference_to` on the BY-NAME object-schema serve path
+too (objectui#7650).
+
+`MetadataProvider` has two paths that hand an object schema to a reader, and only
+one of them normalized. `ensureType('object')` — the LIST path — has run
+`normalizeSchemaReferenceKeys` over every fetched item since objectui#2407 / PR
+#2587. `getItem('object', name)` — the BY-NAME path, behind the published
+`useMetadataItem` hook — ran `extractItem`, which unwraps the `{ item }` envelope
+and normalizes nothing.
+
+So which spelling a reader saw depended on **cache order** rather than on the
+document: warm (the list had already been fetched) it got the def with both keys
+stamped, cold it got whichever single key the producer had stored. A consumer that
+reads one key rendered a raw id in the cold case and the relation in the warm one —
+the objectui#2407 bug, still reachable through the one door left open.
+
+This matters because the serve path never parses. objectui#7650 measured that
+`ObjectStackAdapter.getObjectSchema` applies exactly two mutations and runs no
+`ObjectSchema.parse` at all, so `FieldSchema` strictness gates the WRITE door only:
+a document stored before a key was tightened is served back verbatim, forever, and
+a host with its own `getObjectSchema` is served straight through.
+
+`getItem` now applies the same idempotent, in-place stamp for `type === 'object'`,
+so a def the list pass already normalized is untouched, and no other metadata type
+is affected. Nothing is dropped or overwritten: a spelling the producer set keeps
+its own value.
@@ -786,6 +786,23 @@ export function MetadataProvider({ children, adapter, ttlMs = DEFAULT_TTL_MS }:
       const promise = fetchItem
         .then((res: unknown) => {
           const item = extractItem(res);
+          // objectui#7650 — the BY-NAME serve path needs the same
+          // canonicalization the LIST path applies in `ensureType` above.
+          //
+          // `extractItem` only unwraps the `{ item }` envelope; it normalizes
+          // nothing. So an object def fetched by name reached readers carrying
+          // whichever single spelling its producer stored, while the very same
+          // def arriving through `ensureType` carried both. Which one a reader
+          // got depended on cache order, not on the document — a cold
+          // `useMetadataItem('object', name)` took this path, a warm one hit
+          // the list-populated `byName` entry above and saw the stamped def.
+          //
+          // This is a serve path, not an ingestion path in miniature: the
+          // published `useMetadataItem` hook is exported from
+          // `@object-ui/app-shell`, so the raw def reaches out-of-repo
+          // consumers too. Idempotent and in place, so a def the list pass
+          // already stamped is untouched.
+          if (type === 'object' && item) normalizeSchemaReferenceKeys(item);
           if (item) entry.byName.set(name, item);
           debug(`fetched item type=${type} name=${name} in ${Date.now() - started}ms`);
           pending!.delete(name);
 
@@ -0,0 +1,182 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * objectui#7650 — the BY-NAME object-schema serve path canonicalizes too.
+ *
+ * ## What was broken
+ *
+ * `MetadataProvider` has two paths that hand an object schema to a reader, and
+ * only one of them normalized:
+ *
+ *   - `ensureType('object')` — the LIST path — ran `normalizeSchemaReferenceKeys`
+ *     over every fetched item (objectui#2407 / PR #2587).
+ *   - `getItem('object', name)` — the BY-NAME path, behind the PUBLISHED
+ *     `useMetadataItem` hook — ran `extractItem`, which only unwraps the
+ *     `{ item }` envelope and normalizes nothing.
+ *
+ * So which spelling a reader saw depended on cache order rather than on the
+ * document: warm (list already fetched) it got the stamped def, cold it got
+ * whatever single key the producer stored. objectui#7650 measured that the
+ * serve path never parses, so `FieldSchema` strictness is no evidence a legacy
+ * spelling cannot reach a consumer — a document stored before the key was
+ * tightened is served verbatim, forever.
+ *
+ * ## What these pins hold
+ *
+ * The assertions read the value a CONSUMER gets back from `getItem`, never the
+ * provider's internals — a re-plumbing that still served an unstamped def by
+ * some other route would satisfy an internals assertion and violate the card.
+ *
+ * The negative pins are the load-bearing half: a normalizer that fired for
+ * every metadata type, or that overwrote a key the producer had already set,
+ * would pass every positive assertion here.
+ */
+
+import { describe, it, expect, vi } from 'vitest';
+import { render, waitFor } from '@testing-library/react';
+import { MetadataProvider, useMetadata } from '../MetadataProvider';
+
+type Ctx = ReturnType<typeof useMetadata>;
+
+/**
+ * Serves ONE named document per type from `docs`, and records every by-name
+ * fetch so the cache-order pin can prove which path answered.
+ */
+function makeAdapter(docs: Record<string, Record<string, unknown>>, itemCalls: string[]) {
+  return {
+    clearCache: vi.fn(),
+    getClient: () => ({
+      meta: {
+        // The list path serves nothing: every test here starts from a COLD
+        // by-name cache, which is exactly the state the bug needed.
+        getItems: (type: string) => Promise.resolve({ type, items: [] }),
+        getItem: (type: string, name: string) => {
+          itemCalls.push(`${type}/${name}`);
+          const doc = docs[`${type}/${name}`];
+          // Fresh clone per call — the provider normalizes IN PLACE, and a
+          // shared fixture object would let one test's stamp leak into the next
+          // assertion and turn a red into a green.
+          return Promise.resolve({ item: doc ? structuredClone(doc) : null });
+        },
+      },
+    }),
+  } as unknown as Parameters<typeof MetadataProvider>[0]['adapter'];
+}
+
+/** Mounts the provider and hands the live context back to the test body. */
+async function withProvider(
+  docs: Record<string, Record<string, unknown>>,
+  itemCalls: string[] = [],
+): Promise<Ctx> {
+  let ctx: Ctx | null = null;
+  function Probe() {
+    ctx = useMetadata();
+    return null;
+  }
+  render(
+    <MetadataProvider adapter={makeAdapter(docs, itemCalls)}>
+      <Probe />
+    </MetadataProvider>,
+  );
+  await waitFor(() => expect(ctx).not.toBeNull());
+  return ctx as unknown as Ctx;
+}
+
+describe('MetadataProvider.getItem canonicalizes object schemas (objectui#7650)', () => {
+  it('stamps `reference_to` on a by-name object def that spells only `reference`', async () => {
+    const ctx = await withProvider({
+      'object/account': {
+        name: 'account',
+        fields: { owner: { type: 'lookup', reference: 'user' } },
+      },
+    });
+
+    const item = await ctx.getItem('object', 'account');
+
+    expect(item.fields.owner.reference).toBe('user');
+    expect(item.fields.owner.reference_to).toBe('user');
+  });
+
+  it('stamps `reference` on a by-name object def that spells only the legacy `reference_to`', async () => {
+    const ctx = await withProvider({
+      'object/contact': {
+        name: 'contact',
+        fields: { account_id: { type: 'lookup', reference_to: 'account' } },
+      },
+    });
+
+    const item = await ctx.getItem('object', 'contact');
+
+    expect(item.fields.account_id.reference).toBe('account');
+    expect(item.fields.account_id.reference_to).toBe('account');
+  });
+
+  it('normalizes the ARRAY field-container shape the metadata API also serves', async () => {
+    const ctx = await withProvider({
+      'object/lead': {
+        name: 'lead',
+        fields: [{ name: 'owner', type: 'lookup', reference: 'user' }],
+      },
+    });
+
+    const item = await ctx.getItem('object', 'lead');
+
+    expect(item.fields[0].reference_to).toBe('user');
+  });
+
+  it('NEGATIVE — leaves a non-`object` metadata type untouched', async () => {
+    const ctx = await withProvider({
+      // A `view` document that happens to carry a `fields` map. Nothing but the
+      // `object` type is a field-def carrier, and normalizing one would be this
+      // provider inventing a convention the contract does not declare.
+      'view/account_list': {
+        name: 'account_list',
+        fields: { owner: { type: 'lookup', reference: 'user' } },
+      },
+    });
+
+    const item = await ctx.getItem('view', 'account_list');
+
+    expect(item.fields.owner.reference).toBe('user');
+    expect(item.fields.owner.reference_to).toBeUndefined();
+  });
+
+  it('NEGATIVE — never overwrites a spelling the producer already set', async () => {
+    const ctx = await withProvider({
+      'object/opportunity': {
+        name: 'opportunity',
+        fields: {
+          // Deliberately inconsistent: if the stamp overwrote rather than
+          // filled, one of these two values would change.
+          owner: { type: 'lookup', reference: 'user', reference_to: 'legacy_user' },
+        },
+      },
+    });
+
+    const item = await ctx.getItem('object', 'opportunity');
+
+    expect(item.fields.owner.reference).toBe('user');
+    expect(item.fields.owner.reference_to).toBe('legacy_user');
+  });
+
+  it('serves the SAME canonical shape on a repeat read, without a second fetch', async () => {
+    const itemCalls: string[] = [];
+    const ctx = await withProvider(
+      {
+        'object/account': {
+          name: 'account',
+          fields: { owner: { type: 'lookup', reference: 'user' } },
+        },
+      },
+      itemCalls,
+    );
+
+    await ctx.getItem('object', 'account');
+    const second = await ctx.getItem('object', 'account');
+
+    // The by-name cache answered the second read (so the normalization must
+    // have stuck to the cached object, not to a throwaway copy).
+    expect(itemCalls.filter((c) => c === 'object/account')).toHaveLength(1);
+    expect(second.fields.owner.reference_to).toBe('user');
+  });
+});
@@ -50,14 +50,23 @@
  * ## ⛔ WHAT THIS WARNING DOES NOT COVER — state it, do not overclaim it
  *
  * This warning fires ONLY where this file runs, and this file runs at exactly
- * two production call sites, both of them ingestion choke points:
+ * three production call sites, all of them ingestion choke points:
  *
- *   packages/app-shell/src/providers/MetadataProvider.tsx  (metadata type `object`)
+ *   packages/app-shell/src/providers/MetadataProvider.tsx  (`ensureType`, metadata type `object`)
+ *   packages/app-shell/src/providers/MetadataProvider.tsx  (`getItem`,    metadata type `object`)
  *   packages/data-objectstack/src/index.ts                 (ObjectStackAdapter.getObjectSchema)
  *
- * Both of those STAMP the def, so a def that triggers this warning is also a
- * def that still resolves. ⇒ The warning fires precisely where nothing is
- * broken.
+ * All three STAMP the def, so a def that triggers this warning is also a def
+ * that still resolves. ⇒ The warning fires precisely where nothing is broken.
+ *
+ * ⚠️ The third of those is new in objectui#7650 and the count above used to
+ * read TWO. The old count was true about where this file RAN and false about
+ * the serve surface it was cited for: `MetadataProvider` normalized on its
+ * LIST path only, so an object def fetched BY NAME — the published
+ * `useMetadataItem` hook, and any cold-cache read behind it — was served with
+ * whichever single spelling the producer stored. ⛔ Do not re-derive this list
+ * by grepping for the call: derive it from the serve paths that hand an object
+ * schema to a reader, and check each one calls in.
  *
  * ⚠️ The BREAK surface is the complement of that: `getObjectSchema` is a
  * required member of the published `DataSource` interface and the readers call