Apply patch to @embroider/addon-dev; fixes issue

package.json

@@ -1,4 +1,9 @@
 {
     "name": "v2-addons-as-deps-of-lazy-engines-repro",
-    "private": true
-}
+    "private": true,
+    "pnpm": {
+        "patchedDependencies": {
+            "@embroider/[email protected]": "patches/@[email protected]"
+        }
+    }
+}

patches/@embroider__addon-dev@4.2.1.patch

@@ -0,0 +1,15 @@
+diff --git a/src/rollup-app-reexports.js b/src/rollup-app-reexports.js
+index 1d78bd5aca456fa31f48bdf20c4180f795c66e65..2dbb92af256d1ea19d882687d7f447eec856263f 100644
+--- a/src/rollup-app-reexports.js
++++ b/src/rollup-app-reexports.js
+@@ -26,7 +26,9 @@ function appReexports(opts) {
+                     this.emitFile({
+                         type: 'asset',
+                         fileName: `_app_/${appFilename}`,
+-                        source: `export ${computedExports} from "${pkg.name}/${addonFilename.slice(0, -(0, path_1.extname)(addonFilename).length)}";\n`,
++                        source:
++                          `import thing from "${pkg.name}/${addonFilename.slice(0, -(0, path_1.extname)(addonFilename).length)}";\n` +
++                          `export default thing;\n`,
+                     });
+                 }
+             }

test-app/dist/assets/vendor.js

@@ -52869,6 +52869,7 @@ define("ember-resolver/features", [], function () {
     value: true
   });
   _exports.default = void 0;
+  0; //eaimeta@70e063a35619d71f0,"ember-engines/routes"eaimeta@70e063a35619d71f
   var _default = _exports.default = (0, _routes.default)(function () {
     // route map
   });