diff --git a/src/editor/engine/rbxl-lua-integration.js b/src/editor/engine/rbxl-lua-integration.js
index cbef7f7..224cfc9 100644
--- a/src/editor/engine/rbxl-lua-integration.js
+++ b/src/editor/engine/rbxl-lua-integration.js
@@ -150,6 +150,16 @@ export function handleLuaCommand(_scriptId, cmd, payload, runtime) {
                 canCollide: payload?.canCollide !== false,
             };
             pm.addInstance(payload?.type || 'cube', opts);
+            // Если unanchored — регистрируем в физике на лету, иначе он не падает.
+            if (opts.anchored === false) {
+                try {
+                    const dm = runtime.scene3d?.dynamicsManager;
+                    const data = pm.instances?.get?.(opts.id);
+                    if (dm && data) dm.registerPrimitive(data);
+                } catch (e) {
+                    console.warn('[sceneCreate] registerPrimitive failed', e);
+                }
+            }
         } catch (e) {
             console.error('[sceneCreate]', e);
         }