@@ -0,0 +1,13 @@
+---
+'@objectstack/types': patch
+---
+
+fix(types): the data door answers the sandbox's own fault as a fault, not as "this object does not exist" (#22868)
+
+Clause-②: no
+
+**What was wrong.** The QuickJS runner raises some `SandboxError`s itself. These carry no `innerMessage`. Two of them name the object the hook body addressed: a denied capability on `ctx.api.object(...)` (`capability 'api.read' not granted to hook 'guard' (called ctx.api.object('account').find)`) and a `ctx.api` method the host does not implement (`ctx.api.object('account').find not implemented`). When that object was the one the request named, `mapDataError` read the quoted object name plus the word `not` as an unknown object. `POST /api/v1/data/account` then answered `404 OBJECT_NOT_FOUND` with `Object 'account' is not registered`. Every other runner fault already answered `500 INTERNAL_ERROR`, which is what the runner's contract says these errors are.
+
+**What changes.** `mapDataError` checks `isSandboxOwnFault` first, next to the existing check for a sandboxed body that crashed. An error the sandbox raised itself now answers `500 INTERNAL_ERROR` with `Internal server error`, whatever its text names. The runner's text goes to the server log only. The sync `/import` row and the `/import/jobs` stored row read that same sentence.
+
+**Unchanged.** A driver's unknown-object text (`no such table: account`, `relation "account" does not exist`) still answers `404 OBJECT_NOT_FOUND`. So does the same wording thrown by anything other than the sandbox: the check reads the error's producer, not its words. A hook body's refusal keeps its sentence and status, and a crash keeps its `500`.
@@ -48,11 +48,13 @@
  * not raise. `import-runner-sandbox-refusal-row.test.ts` §4 is the driver-text
  * control #22718's ablation B pinned, and it is not edited here.
  *
- * The sample object name in a rendered message is deliberately NOT the
- * import's object. `mapDataError`'s unknown-object heuristic answers `404
- * OBJECT_NOT_FOUND` for a text that names the requested object and contains
- * `not`, which a capability denial on that object does. That is a door
- * defect outside this card; the row does not copy a 4xx sentence.
+ * [#22868] The sample object name in a rendered message IS the import's
+ * object. Two sites name it — the `ctx.api.object(…)` capability gate and the
+ * missing-method arm — and `mapDataError`'s unknown-object heuristic answered
+ * those `404 OBJECT_NOT_FOUND` (a quoted requested-object name plus `not`)
+ * until the door asked `isSandboxOwnFault` first. So §1 holds each site that
+ * names the requested object to the door's `500`, and §3 holds the controls
+ * that keep the heuristic's other answers where they were.
  */
 
 import { readFileSync } from 'node:fs';
@@ -68,10 +70,12 @@ const HERE = dirname(fileURLToPath(import.meta.url));
 const RUNNER = resolve(HERE, '../../../runtime/src/sandbox/quickjs-runner.ts');
 const SOURCE = ts.createSourceFile(RUNNER, readFileSync(RUNNER, 'utf8'), ts.ScriptTarget.Latest, true);
 
+const OBJECT = 'mz_locked';
+
 /**
  * One sample per interpolation the runner's fault messages use. A message
  * naming an expression not listed here is unrenderable, and §1's census says
- * which. `objectName` is not the import's object (see the header).
+ * which. `objectName` is the import's object (see the header).
  */
 const SAMPLES: Readonly<Record<string, string>> = {
   'args.origin.kind': 'hook',
@@ -82,7 +86,7 @@ const SAMPLES: Readonly<Record<string, string>> = {
   wallCeiling: '30000',
   pumps: '3',
   'formatErr(msg)': 'SyntaxError: unexpected token',
-  objectName: 'mz_other',
+  objectName: OBJECT,
   method: 'find',
   required: 'api.read',
   fieldName: 'owner',
@@ -219,6 +223,11 @@ const census = (() => {
 
 const PRODUCER_NAME = producerName();
 
+/** [#22868] The fault sites whose rendered message quotes the requested object. */
+function namingTheObject(): Site[] {
+  return census.faults.filter((s) => s.message.includes(`'${OBJECT}'`));
+}
+
 /** The producer's own fault: its declared `name`, and no `innerMessage`. */
 function ownFault(message: string): Error {
   const err = new Error(message);
@@ -228,8 +237,6 @@ function ownFault(message: string): Error {
 
 type CreateArgs = Parameters<ImportProtocolLike['createData']>[0];
 
-const OBJECT = 'mz_locked';
-
 const baseOpts = {
   objectName: OBJECT,
   metaMap: new Map<string, ExportFieldMeta>([['name', { name: 'name', type: 'text' }]]),
@@ -280,6 +287,11 @@ describe('[#22741] §1 — every fault the runner raises itself reads the door\'
     }
     // §2's population: the constructions that set `innerMessage` (crash and refusal sites).
     expect(census.crashes.length).toBeGreaterThanOrEqual(4);
+    // [#22868] The sites that name the requested object: the `ctx.api.object(…)`
+    // capability gate and the missing-method arm, each held to `500` below.
+    const named = namingTheObject();
+    expect(named.filter((s) => /^capability '/.test(s.message)).length, 'capability denial').toBeGreaterThanOrEqual(1);
+    expect(named.filter((s) => /not implemented$/.test(s.message)).length, 'missing ctx.api method').toBeGreaterThanOrEqual(1);
   });
 
   it.each(census.faults.map((s) => [s.label, s.message] as const))('%s', async (_label, message) => {
@@ -331,6 +343,28 @@ describe('[#22741] §3 — controls: what the predicate must NOT change', () =>
     expect((await rowFor(err)).error).toBe(sanitizeRowError(budget()));
   });
 
+  it.each([
+    ['SQLite', `SQLITE_ERROR: no such table: ${OBJECT}`],
+    ['Postgres', `relation "${OBJECT}" does not exist`],
+  ])('CONTROL [#22868] — a real %s unknown-object text on the requested object still answers 404', (_driver, text) => {
+    const door = mapDataError(new Error(text), OBJECT);
+    expect(door.status).toBe(404);
+    expect(door.body.code).toBe('OBJECT_NOT_FOUND');
+  });
+
+  it('CONTROL [#22868] — the same object-naming texts, thrown by anything but the sandbox, keep the heuristic\'s 404', () => {
+    // The door asks the producer's identity, never the words: no second rule.
+    const named = namingTheObject();
+    expect(named.length).toBeGreaterThanOrEqual(2);
+    for (const { label, message } of named) {
+      const err = new Error(message);
+      expect(isSandboxOwnFault(err), label).toBe(false);
+      const door = mapDataError(err, OBJECT);
+      expect(door.status, label).toBe(404);
+      expect(door.body.code, label).toBe('OBJECT_NOT_FOUND');
+    }
+  });
+
   it('CONTROL — a code-defined hook\'s native TypeError keeps its text, as the filing says', async () => {
     const text = "Cannot read properties of undefined (reading 'owner')";
     const err = () => new TypeError(text);
 
@@ -795,11 +795,12 @@ function isSandboxOrigin(error: any): boolean {
  * runner's row report (`@objectstack/core`) sits below `@objectstack/runtime`
  * and never sees the class.
  *
- * ⛔ Not a withholding rule. {@link mapDataError} asks nothing here: it answers
- * these errors from their message like any other unclassified throw, which for
- * the runner's fault texts is its sanitised `500 INTERNAL_ERROR` terminal. This
- * predicate lets the import row recognise the error so it can take that door's
- * sentence, as it does for a crash; the verdict stays the door's.
+ * [#22868] {@link classifyDataError} asks it at its top, beside
+ * {@link isSandboxCrash}, and answers the sanitised `500 INTERNAL_ERROR`
+ * terminal — the answer it already gave these errors from their message,
+ * except where a text named the request's own object and the unknown-object
+ * heuristic answered `404`. The import row still takes that door's sentence
+ * through this predicate, as it does for a crash; the verdict stays the door's.
  */
 export function isSandboxOwnFault(error: unknown): boolean {
     const name = (error as { name?: unknown } | null | undefined)?.name;
@@ -1336,6 +1337,28 @@ function classifyDataError(error: any, object?: string): { status: number; body:
     // ⛔ The terminal is not duplicated — it MOVED here from inside the unwrap
     // door below, which is why that door now reads a body that REPORTED.
     if (isSandboxCrash(error)) return UNCLASSIFIED_FAULT();
+    // [#22868] …and so is the sandbox's OWN fault ({@link isSandboxOwnFault}):
+    // a capability denial, an unavailable `ctx.api`, a missing `ctx.api`
+    // method, a budget, an install or marshal failure. Its producer's contract
+    // calls it a fault, and it carries no `code`, no `status` and no
+    // `innerMessage`, so nothing below could ever read it as anything else but
+    // its message TEXT. Two of those texts name the object the body addressed
+    // — `capability 'api.read' not granted to hook 'H' (called
+    // ctx.api.object('OBJ').find)` and `ctx.api.object('OBJ').find not
+    // implemented` — and when OBJ was the request's own object the
+    // unknown-object substring limb (a quoted object name plus `not`) answered
+    // `404 OBJECT_NOT_FOUND`, telling the caller the object does not exist.
+    //
+    // Asked HERE rather than beside that limb, because every message limb
+    // below reads text the runner interpolates from the body's own arguments
+    // (`ctx.api.object(name)`, `ctx.title(field)`), so a limb-local exclusion
+    // would fix one limb and leave the others free to misread the same fault.
+    // The answer is the terminal the other runner faults already reached, so
+    // only the misread ones move; the nested crash the pump loop relays as a
+    // fault reached it too, through the wrapper fallback below. ⛔ Not a second
+    // rule: the predicate reads the producer's identity, never the text, so
+    // the same words thrown by anything else keep the heuristic's answer.
+    if (isSandboxOwnFault(error)) return UNCLASSIFIED_FAULT();
     // [commit 6d178a408] The bespoke structured arms first, exactly as they were inline
     // here — same arms, same order, same position — now stated once so
     // {@link resolveErrorResponse} can ask them before ITS passthrough too.