diff --git a/sdk/lib/_internal/wasm/lib/growable_list.dart b/sdk/lib/_internal/wasm/lib/growable_list.dart
index 513c1ef47e5..f824469b0d2 100644
--- a/sdk/lib/_internal/wasm/lib/growable_list.dart
+++ b/sdk/lib/_internal/wasm/lib/growable_list.dart
@@ -97,7 +97,7 @@ class _GrowableList<E> extends _ModifiableList<E> {
       data = WasmArray<Object?>(_nextCapacity(_capacity));
       if (index != 0) {
         // Copy elements before the insertion point.
-        data.copy(0, _data, 0, index - 1);
+        data.copy(0, _data, 0, index);
       }
     } else {
       data = _data;
diff --git a/tests/lib/collection/regress_54845_test.dart b/tests/lib/collection/regress_54845_test.dart
new file mode 100644
index 00000000000..6354b5cbb77
--- /dev/null
+++ b/tests/lib/collection/regress_54845_test.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2024, 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 'package:expect/expect.dart';
+
+main() {
+  final l = [10, 20, 30];
+  for (int i = l.length; i-- > 0;) {
+    if (i > 0) l.insert(i, -1);
+  }
+  Expect.deepEquals([10, -1, 20, -1, 30], l);
+}