diff --git a/docs/api-core.md b/docs/api-core.md
index 1d6a1e5..2b8a5a8 100644
--- a/docs/api-core.md
+++ b/docs/api-core.md
@@ -72,9 +72,8 @@ set `canvas.tabIndex = 0` and call `canvas.focus()` so keyboard events reach the
 | `detectDroppedFrames` | `boolean`                | `false`     | Log a console warning on missed vsync         |
 
 **`BT` getters vs `configure()` fields:** `displaySize`, `canvasDisplaySize`, and `targetFPS` on `BT` mirror the same
-names on {@link HardwareSettings}. `outputSize` is the effective drawing-buffer size
-(`canvasDisplaySize ?? displaySize`). `activeBackend` is the backend that actually started (after fallback), not the
-`renderer` value from `configure()`.
+names on `HardwareSettings`. `outputSize` is the effective drawing-buffer size (`canvasDisplaySize ?? displaySize`).
+`activeBackend` is the backend that actually started (after fallback), not the `renderer` value from `configure()`.
 
 ---
 
diff --git a/src/BlitTech.test.ts b/src/BlitTech.test.ts
index 8bbb13f..ed6442c 100644
--- a/src/BlitTech.test.ts
+++ b/src/BlitTech.test.ts
@@ -155,6 +155,18 @@ describe('BT.canvasDisplaySize', () => {
         expect(size?.x).toBe(640);
         expect(size?.y).toBe(480);
     });
+
+    it('returns an independent clone per read', () => {
+        vi.spyOn(BTAPI.instance, 'getHardwareSettings').mockReturnValue({
+            ...mockHardwareSettings(),
+            canvasDisplaySize: new Vector2i(640, 480),
+        });
+
+        const first = BT.canvasDisplaySize;
+        first!.x = 999;
+
+        expect(BT.canvasDisplaySize?.x).toBe(640);
+    });
 });
 
 describe('BT.outputSize', () => {
@@ -191,6 +203,15 @@ describe('BT.outputSize', () => {
         expect(size.x).toBe(640);
         expect(size.y).toBe(480);
     });
+
+    it('returns an independent clone per read', () => {
+        vi.spyOn(BTAPI.instance, 'getHardwareSettings').mockReturnValue(mockHardwareSettings(new Vector2i(320, 240)));
+
+        const first = BT.outputSize;
+        first.x = 999;
+
+        expect(BT.outputSize.x).toBe(320);
+    });
 });
 
 // #endregion
@@ -545,6 +566,16 @@ describe('BT.camera', () => {
 
         expect(result).toBe(expected);
     });
+
+    it('returns an independent clone per read', () => {
+        const stored = new Vector2i(64, 32);
+        vi.spyOn(BTAPI.instance, 'getCameraOffset').mockImplementation(() => stored.clone());
+
+        const first = BT.camera;
+        first.x = 999;
+
+        expect(BT.camera.x).toBe(64);
+    });
 });
 
 describe('BT.cameraClamp', () => {