diff --git a/compiler/testData/codegen/box/strings/concatDynamicWithConstants.kt b/compiler/testData/codegen/box/strings/concatDynamicWithConstants.kt
index 92febdaede6..08b574bb495 100644
--- a/compiler/testData/codegen/box/strings/concatDynamicWithConstants.kt
+++ b/compiler/testData/codegen/box/strings/concatDynamicWithConstants.kt
@@ -1,14 +1,13 @@
 // Will be executed on JDK 9, 11, 15
 // IGNORE_BACKEND: ANDROID
+
 fun test(z: Int): String {
     val result = "" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" +
             z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" +
             z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" +
             z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" +
             z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" +
-            z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" +
-            z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1" + z + "1"
-
+            z + "1" + z + "1" + z + "1" + z + "1"
 
     return result
 }
@@ -16,8 +15,11 @@ fun test(z: Int): String {
 fun box(): String {
     val result = test(0)
 
-    if (result.length != 280)
+    if (result.length != 208)
         return "fail 1: ${result.length}"
 
-    return if (result != "0101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101") "fail 2: ${result}" else "OK"
-}
\ No newline at end of file
+    if (result != "0101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101")
+        return "fail 2: $result"
+
+    return "OK"
+}
diff --git a/compiler/testData/codegen/box/strings/concatDynamicWithSpecialSymbols.kt b/compiler/testData/codegen/box/strings/concatDynamicWithSpecialSymbols.kt
index 8d3cf94db93..4a6dc1adfea 100644
--- a/compiler/testData/codegen/box/strings/concatDynamicWithSpecialSymbols.kt
+++ b/compiler/testData/codegen/box/strings/concatDynamicWithSpecialSymbols.kt
@@ -1,7 +1,5 @@
 // Will be executed on JDK 9, 11, 15
 // IGNORE_BACKEND: ANDROID
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: FLAKY
 
 fun test(z: Int): String {
     val result = "" + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() +
@@ -9,9 +7,7 @@ fun test(z: Int): String {
             z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() +
             z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() +
             z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() +
-            z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() +
-            z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 2.toChar()
-
+            z + 1.toChar() + z + 1.toChar() + z + 1.toChar() + z + 2.toChar()
 
     return result
 }
@@ -19,10 +15,11 @@ fun test(z: Int): String {
 fun box(): String {
     val result = test(0)
 
-    if (result.length != 280)
+    if (result.length != 208)
         return "fail 1: ${result.length}"
 
-    return if (result != "0\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u0002")
-        "fail 2: ${result}"
-    else "OK"
-}
\ No newline at end of file
+    if (result != "0\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u00010\u0002")
+        return "fail 2: $result"
+
+    return "OK"
+}
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
index d6c6d78ba64..2c534ab6c11 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
@@ -25681,6 +25681,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/strings/concatDynamicWithConstants.kt");
         }
 
+        @TestMetadata("concatDynamicWithSpecialSymbols.kt")
+        public void testConcatDynamicWithSpecialSymbols() throws Exception {
+            runTest("compiler/testData/codegen/box/strings/concatDynamicWithSpecialSymbols.kt");
+        }
+
         @TestMetadata("concatGenericWithNullablePrimitiveUpperBound.kt")
         public void testConcatGenericWithNullablePrimitiveUpperBound() throws Exception {
             runTest("compiler/testData/codegen/box/strings/concatGenericWithNullablePrimitiveUpperBound.kt");