Add another test for KT-49715 and fix JS IR behavior

#KT-49715
 #KT-51798 Fixed

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/JsCodegenBoxTestGenerated.java

@@ -9731,6 +9731,12 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/dataClasses/kt49715.kt");
         }
 
+        @Test
+        @TestMetadata("kt49715_behaviorChange.kt")
+        public void testKt49715_behaviorChange() throws Exception {
+            runTest("compiler/testData/codegen/box/dataClasses/kt49715_behaviorChange.kt");
+        }
+
         @Test
         @TestMetadata("mixedParams.kt")
         public void testMixedParams() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsCodegenBoxTestGenerated.java

@@ -9773,6 +9773,12 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/dataClasses/kt49715.kt");
         }
 
+        @Test
+        @TestMetadata("kt49715_behaviorChange.kt")
+        public void testKt49715_behaviorChange() throws Exception {
+            runTest("compiler/testData/codegen/box/dataClasses/kt49715_behaviorChange.kt");
+        }
+
         @Test
         @TestMetadata("mixedParams.kt")
         public void testMixedParams() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java

@@ -8554,6 +8554,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/dataClasses/kt49715.kt");
         }
 
+        @TestMetadata("kt49715_behaviorChange.kt")
+        public void testKt49715_behaviorChange() throws Exception {
+            runTest("compiler/testData/codegen/box/dataClasses/kt49715_behaviorChange.kt");
+        }
+
         @TestMetadata("mixedParams.kt")
         public void testMixedParams() throws Exception {
             runTest("compiler/testData/codegen/box/dataClasses/mixedParams.kt");