diff --git a/pkg/dart2wasm/lib/closures.dart b/pkg/dart2wasm/lib/closures.dart
index 1c60925f201..baa63995e69 100644
--- a/pkg/dart2wasm/lib/closures.dart
+++ b/pkg/dart2wasm/lib/closures.dart
@@ -203,10 +203,10 @@ class ClosureLayouter extends RecursiveVisitor {
       representations;
 
   // Dynamic submodules invoke closures dynamically so they use the base structs
-  // in all cases. Therefore, We only need one global copy of the
-  // ClosureRepresentation for generic and one for non-generic functions.
-  ClosureRepresentation? _dynamicSubmoduleRepresentation;
-  ClosureRepresentation? _dynamicSubmoduleGenericRepresentation;
+  // in all cases. Therefore, we only need one global copy of the
+  // ClosureRepresentation for each type parameter count.
+  final Map<int, ClosureRepresentation>
+      _dynamicSubmoduleGenericRepresentations = {};
 
   Set<Constant> visitedConstants = Set.identity();
 
@@ -484,11 +484,7 @@ class ClosureLayouter extends RecursiveVisitor {
   ClosureRepresentation? getClosureRepresentation(
       int typeCount, int positionalCount, List<String> names) {
     if (translator.dynamicModuleSupportEnabled) {
-      if (typeCount == 0) {
-        return _dynamicSubmoduleRepresentation ??=
-            _createRepresentation(typeCount, 0, const [], null, null, const []);
-      }
-      return _dynamicSubmoduleGenericRepresentation ??=
+      return _dynamicSubmoduleGenericRepresentations[typeCount] ??=
           _createRepresentation(typeCount, 0, const [], null, null, const []);
     }
     final representations =
diff --git a/pkg/dynamic_modules/test/data/closure_instantiation/dynamic_interface.yaml b/pkg/dynamic_modules/test/data/closure_instantiation/dynamic_interface.yaml
new file mode 100644
index 00000000000..988bfc2a53d
--- /dev/null
+++ b/pkg/dynamic_modules/test/data/closure_instantiation/dynamic_interface.yaml
@@ -0,0 +1,7 @@
+# Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+callable:
+  - library: 'dart:core'
+  - library: 'shared/shared.dart'
+  - library: 'package:expect/expect.dart'
diff --git a/pkg/dynamic_modules/test/data/closure_instantiation/main.dart b/pkg/dynamic_modules/test/data/closure_instantiation/main.dart
new file mode 100644
index 00000000000..a8dd748b8cb
--- /dev/null
+++ b/pkg/dynamic_modules/test/data/closure_instantiation/main.dart
@@ -0,0 +1,21 @@
+// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import '../../common/testing.dart' as helper;
+import 'package:expect/expect.dart';
+
+import 'shared/shared.dart' as shared;
+
+void main() async {
+  final wrap = shared.wrap<int, String>;
+  final wrapped = wrap(3, 'hello');
+  Expect.equals(3, wrapped.$1);
+  Expect.equals('hello', wrapped.$2);
+  final dynModWrap =
+      await helper.load('entry1.dart') as (bool, int) Function(bool k, int v);
+  final dynModWrapped = dynModWrap(true, 5);
+  Expect.equals(true, dynModWrapped.$1);
+  Expect.equals(5, dynModWrapped.$2);
+  helper.done();
+}
diff --git a/pkg/dynamic_modules/test/data/closure_instantiation/modules/entry1.dart b/pkg/dynamic_modules/test/data/closure_instantiation/modules/entry1.dart
new file mode 100644
index 00000000000..1c5dab89ff2
--- /dev/null
+++ b/pkg/dynamic_modules/test/data/closure_instantiation/modules/entry1.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import '../shared/shared.dart' as shared;
+import 'package:expect/expect.dart';
+
+@pragma('dyn-module:entry-point')
+Object dynamicModuleEntrypoint() {
+  final wrap = shared.wrap<List<int>, String>;
+  final wrapped = wrap([20], 'foo');
+  Expect.equals(20, wrapped.$1[0]);
+  Expect.equals('foo', wrapped.$2);
+  return shared.wrap<bool, int>;
+}
diff --git a/pkg/dynamic_modules/test/data/closure_instantiation/shared/shared.dart b/pkg/dynamic_modules/test/data/closure_instantiation/shared/shared.dart
new file mode 100644
index 00000000000..5b2edcf2828
--- /dev/null
+++ b/pkg/dynamic_modules/test/data/closure_instantiation/shared/shared.dart
@@ -0,0 +1,5 @@
+// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+(K, V) wrap<K, V>(K k, V v) => (k, v);