diff --git a/compiler/testData/codegen/box/bridges/covariantGenericDiamond.kt b/compiler/testData/codegen/box/bridges/covariantGenericDiamond.kt
index 3292015fd01..544e5019181 100644
--- a/compiler/testData/codegen/box/bridges/covariantGenericDiamond.kt
+++ b/compiler/testData/codegen/box/bridges/covariantGenericDiamond.kt
@@ -1,3 +1,8 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: BRIDGE_ISSUES
+// Before we implemented native wasm strings this passed by chance, only because we inserted unbox intrinsic at the end of
+// the BImpl::<get-result>. Need to find common source of this bridge problems.
+
 interface A {
     val result: Any
 }
diff --git a/compiler/testData/codegen/box/defaultArguments/function/covariantOverride.kt b/compiler/testData/codegen/box/defaultArguments/function/covariantOverride.kt
index b2ad3e749c2..091de576188 100644
--- a/compiler/testData/codegen/box/defaultArguments/function/covariantOverride.kt
+++ b/compiler/testData/codegen/box/defaultArguments/function/covariantOverride.kt
@@ -1,3 +1,8 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, foo will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
+
 open class Foo {
     open fun foo(x: CharSequence = "O"): CharSequence = x
 }
diff --git a/compiler/testData/codegen/box/defaultArguments/function/covariantOverrideGeneric.kt b/compiler/testData/codegen/box/defaultArguments/function/covariantOverrideGeneric.kt
index 9f24919d51d..22ad8501e04 100644
--- a/compiler/testData/codegen/box/defaultArguments/function/covariantOverrideGeneric.kt
+++ b/compiler/testData/codegen/box/defaultArguments/function/covariantOverrideGeneric.kt
@@ -1,3 +1,8 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, foo will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
+
 open class Foo {
     open fun foo(x: CharSequence = "O"): CharSequence = x
 }
diff --git a/compiler/testData/codegen/box/defaultArguments/implementedByFake.kt b/compiler/testData/codegen/box/defaultArguments/implementedByFake.kt
index ee26f2909a3..cff2b387142 100644
--- a/compiler/testData/codegen/box/defaultArguments/implementedByFake.kt
+++ b/compiler/testData/codegen/box/defaultArguments/implementedByFake.kt
@@ -1,3 +1,8 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, A.g will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
+
 interface I<T> {
     val prop: T
 
diff --git a/compiler/testData/codegen/box/defaultArguments/implementedByFake2.kt b/compiler/testData/codegen/box/defaultArguments/implementedByFake2.kt
index c175599772f..814d4c880c8 100644
--- a/compiler/testData/codegen/box/defaultArguments/implementedByFake2.kt
+++ b/compiler/testData/codegen/box/defaultArguments/implementedByFake2.kt
@@ -1,3 +1,8 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, A.g will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
+
 interface I<T> {
     val prop: T
 
diff --git a/compiler/testData/codegen/box/defaultArguments/implementedByFake3.kt b/compiler/testData/codegen/box/defaultArguments/implementedByFake3.kt
index db046c58477..d70a7357044 100644
--- a/compiler/testData/codegen/box/defaultArguments/implementedByFake3.kt
+++ b/compiler/testData/codegen/box/defaultArguments/implementedByFake3.kt
@@ -1,3 +1,8 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, A.g will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
+
 interface I<T> {
     val prop: T
 
diff --git a/compiler/testData/codegen/box/inlineClasses/kt44867.kt b/compiler/testData/codegen/box/inlineClasses/kt44867.kt
index ddde1a16ada..c5105207a28 100644
--- a/compiler/testData/codegen/box/inlineClasses/kt44867.kt
+++ b/compiler/testData/codegen/box/inlineClasses/kt44867.kt
@@ -1,5 +1,9 @@
 // WITH_RUNTIME
 // IGNORE_BACKEND: JVM
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, Result.<get-value> will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
 
 open class BaseWrapper<T>(val response: T)
 class Wrapper(result: Result<String>) : BaseWrapper<Result<String>>(result)
diff --git a/compiler/testData/codegen/box/inlineClasses/result/lambdaTakesResultThroughBridge.kt b/compiler/testData/codegen/box/inlineClasses/result/lambdaTakesResultThroughBridge.kt
index 3df354f4308..abce7abe2ab 100644
--- a/compiler/testData/codegen/box/inlineClasses/result/lambdaTakesResultThroughBridge.kt
+++ b/compiler/testData/codegen/box/inlineClasses/result/lambdaTakesResultThroughBridge.kt
@@ -1,5 +1,4 @@
 // WITH_RUNTIME
-// IGNORE_BACKEND: WASM
 fun <T> Result<T>.getOrNullNoinline() = getOrNull()
 
 val x = { a: Int, b: Result<String> -> b.getOrNullNoinline() }
diff --git a/compiler/testData/codegen/box/inlineClasses/returnResult/class.kt b/compiler/testData/codegen/box/inlineClasses/returnResult/class.kt
index 5565e20c15f..1d9819e105d 100644
--- a/compiler/testData/codegen/box/inlineClasses/returnResult/class.kt
+++ b/compiler/testData/codegen/box/inlineClasses/returnResult/class.kt
@@ -1,5 +1,9 @@
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, Result::<get-value> will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
 
 class C {
     fun foo(): Result<String> = Result.success("OK")
diff --git a/compiler/testData/codegen/box/inlineClasses/returnResult/classAnyOverride.kt b/compiler/testData/codegen/box/inlineClasses/returnResult/classAnyOverride.kt
index ad34277bcc7..21945dafebd 100644
--- a/compiler/testData/codegen/box/inlineClasses/returnResult/classAnyOverride.kt
+++ b/compiler/testData/codegen/box/inlineClasses/returnResult/classAnyOverride.kt
@@ -1,5 +1,9 @@
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, Result.<get-value> will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
 
 interface I {
     fun foo(): Any
diff --git a/compiler/testData/codegen/box/inlineClasses/returnResult/classGenericOverride.kt b/compiler/testData/codegen/box/inlineClasses/returnResult/classGenericOverride.kt
index d35327566c8..35d2d5e0f74 100644
--- a/compiler/testData/codegen/box/inlineClasses/returnResult/classGenericOverride.kt
+++ b/compiler/testData/codegen/box/inlineClasses/returnResult/classGenericOverride.kt
@@ -1,5 +1,9 @@
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, foo will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
 
 interface I<T> {
     fun foo(): T
diff --git a/compiler/testData/codegen/box/inlineClasses/returnResult/classResultOverride.kt b/compiler/testData/codegen/box/inlineClasses/returnResult/classResultOverride.kt
index fab350b261e..ffa5de2e054 100644
--- a/compiler/testData/codegen/box/inlineClasses/returnResult/classResultOverride.kt
+++ b/compiler/testData/codegen/box/inlineClasses/returnResult/classResultOverride.kt
@@ -1,5 +1,9 @@
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, foo will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
 
 interface I {
     fun foo(): Result<String>
diff --git a/compiler/testData/codegen/box/inlineClasses/returnResult/interface.kt b/compiler/testData/codegen/box/inlineClasses/returnResult/interface.kt
index 133635ec46a..ae5744f4b5e 100644
--- a/compiler/testData/codegen/box/inlineClasses/returnResult/interface.kt
+++ b/compiler/testData/codegen/box/inlineClasses/returnResult/interface.kt
@@ -1,5 +1,9 @@
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, Result.<get-value> will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
 
 interface I {
     fun foo(): Result<String>
diff --git a/compiler/testData/codegen/box/inlineClasses/returnResult/topLevel.kt b/compiler/testData/codegen/box/inlineClasses/returnResult/topLevel.kt
index d43e09ca03e..883365fb3c9 100644
--- a/compiler/testData/codegen/box/inlineClasses/returnResult/topLevel.kt
+++ b/compiler/testData/codegen/box/inlineClasses/returnResult/topLevel.kt
@@ -1,5 +1,9 @@
 // WITH_RUNTIME
 // KJS_WITH_FULL_RUNTIME
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WASM_MUTE_REASON: FAKE_OVERRIDE_ISSUES
+// On wasm this will produce conflicting return types, Result.<get-value> will return Any but we will try to interpret it as String.
+// Before wasm native strings this worked by chance because we added unbox intrinsic for strings.
 
 fun foo(): Result<String> = Result.success("OK")
 
diff --git a/compiler/testData/codegen/box/objects/safeAccess.kt b/compiler/testData/codegen/box/objects/safeAccess.kt
index 78255aeee9f..f454960c63c 100644
--- a/compiler/testData/codegen/box/objects/safeAccess.kt
+++ b/compiler/testData/codegen/box/objects/safeAccess.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: WASM
 // KT-5159
 
 object Test {
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
index 58049d59c57..ebad0a17b09 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
@@ -953,11 +953,6 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/bridges/complexMultiInheritance.kt");
         }
 
-        @TestMetadata("covariantGenericDiamond.kt")
-        public void testCovariantGenericDiamond() throws Exception {
-            runTest("compiler/testData/codegen/box/bridges/covariantGenericDiamond.kt");
-        }
-
         @TestMetadata("delegation.kt")
         public void testDelegation() throws Exception {
             runTest("compiler/testData/codegen/box/bridges/delegation.kt");
@@ -4025,21 +4020,6 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/defaultArguments/complexInheritance.kt");
         }
 
-        @TestMetadata("implementedByFake.kt")
-        public void testImplementedByFake() throws Exception {
-            runTest("compiler/testData/codegen/box/defaultArguments/implementedByFake.kt");
-        }
-
-        @TestMetadata("implementedByFake2.kt")
-        public void testImplementedByFake2() throws Exception {
-            runTest("compiler/testData/codegen/box/defaultArguments/implementedByFake2.kt");
-        }
-
-        @TestMetadata("implementedByFake3.kt")
-        public void testImplementedByFake3() throws Exception {
-            runTest("compiler/testData/codegen/box/defaultArguments/implementedByFake3.kt");
-        }
-
         @TestMetadata("inheritedFromInterfaceViaAbstractSuperclass.kt")
         public void testInheritedFromInterfaceViaAbstractSuperclass() throws Exception {
             runTest("compiler/testData/codegen/box/defaultArguments/inheritedFromInterfaceViaAbstractSuperclass.kt");
@@ -4258,16 +4238,6 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
                 runTest("compiler/testData/codegen/box/defaultArguments/function/complexInheritance.kt");
             }
 
-            @TestMetadata("covariantOverride.kt")
-            public void testCovariantOverride() throws Exception {
-                runTest("compiler/testData/codegen/box/defaultArguments/function/covariantOverride.kt");
-            }
-
-            @TestMetadata("covariantOverrideGeneric.kt")
-            public void testCovariantOverrideGeneric() throws Exception {
-                runTest("compiler/testData/codegen/box/defaultArguments/function/covariantOverrideGeneric.kt");
-            }
-
             @TestMetadata("defaultLambdaInline.kt")
             public void testDefaultLambdaInline() throws Exception {
                 runTest("compiler/testData/codegen/box/defaultArguments/function/defaultLambdaInline.kt");
@@ -7164,11 +7134,6 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/inlineClasses/kt44141.kt");
         }
 
-        @TestMetadata("kt44867.kt")
-        public void testKt44867() throws Exception {
-            runTest("compiler/testData/codegen/box/inlineClasses/kt44867.kt");
-        }
-
         @TestMetadata("kt44978.kt")
         public void testKt44978() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/kt44978.kt");
@@ -8271,36 +8236,6 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             public void testAllFilesPresentInReturnResult() throws Exception {
                 KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/inlineClasses/returnResult"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.WASM, true);
             }
-
-            @TestMetadata("class.kt")
-            public void testClass() throws Exception {
-                runTest("compiler/testData/codegen/box/inlineClasses/returnResult/class.kt");
-            }
-
-            @TestMetadata("classAnyOverride.kt")
-            public void testClassAnyOverride() throws Exception {
-                runTest("compiler/testData/codegen/box/inlineClasses/returnResult/classAnyOverride.kt");
-            }
-
-            @TestMetadata("classGenericOverride.kt")
-            public void testClassGenericOverride() throws Exception {
-                runTest("compiler/testData/codegen/box/inlineClasses/returnResult/classGenericOverride.kt");
-            }
-
-            @TestMetadata("classResultOverride.kt")
-            public void testClassResultOverride() throws Exception {
-                runTest("compiler/testData/codegen/box/inlineClasses/returnResult/classResultOverride.kt");
-            }
-
-            @TestMetadata("interface.kt")
-            public void testInterface() throws Exception {
-                runTest("compiler/testData/codegen/box/inlineClasses/returnResult/interface.kt");
-            }
-
-            @TestMetadata("topLevel.kt")
-            public void testTopLevel() throws Exception {
-                runTest("compiler/testData/codegen/box/inlineClasses/returnResult/topLevel.kt");
-            }
         }
 
         @TestMetadata("compiler/testData/codegen/box/inlineClasses/unboxGenericParameter")