diff --git a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
index fb2646cdd0f..439bf125035 100644
--- a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
+++ b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
@@ -24152,6 +24152,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/properties/extensionPropertyMustHaveAccessorsOrBeAbstract.kt");
             }
 
+            @Test
+            @TestMetadata("kt47621.kt")
+            public void testKt47621() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/properties/kt47621.kt");
+            }
+
             @Test
             @TestMetadata("lateinitOnTopLevel.kt")
             public void testLateinitOnTopLevel() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
index c2a623de926..e88bd308c81 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
@@ -24152,6 +24152,12 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirDiagnosti
                 runTest("compiler/testData/diagnostics/tests/properties/extensionPropertyMustHaveAccessorsOrBeAbstract.kt");
             }
 
+            @Test
+            @TestMetadata("kt47621.kt")
+            public void testKt47621() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/properties/kt47621.kt");
+            }
+
             @Test
             @TestMetadata("lateinitOnTopLevel.kt")
             public void testLateinitOnTopLevel() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
index cefaed3433d..3e01a51a240 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
@@ -24152,6 +24152,12 @@ public class FirOldFrontendDiagnosticsWithLightTreeTestGenerated extends Abstrac
                 runTest("compiler/testData/diagnostics/tests/properties/extensionPropertyMustHaveAccessorsOrBeAbstract.kt");
             }
 
+            @Test
+            @TestMetadata("kt47621.kt")
+            public void testKt47621() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/properties/kt47621.kt");
+            }
+
             @Test
             @TestMetadata("lateinitOnTopLevel.kt")
             public void testLateinitOnTopLevel() throws Exception {
diff --git a/compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/ProtectedSyntheticExtensionCallChecker.kt b/compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/ProtectedSyntheticExtensionCallChecker.kt
index 5b947e11c1b..78c614599c7 100644
--- a/compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/ProtectedSyntheticExtensionCallChecker.kt
+++ b/compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/ProtectedSyntheticExtensionCallChecker.kt
@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.diagnostics.DiagnosticFactory3
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.psi.KtDotQualifiedExpression
+import org.jetbrains.kotlin.psi.KtQualifiedExpression
 import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker
 import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
 import org.jetbrains.kotlin.resolve.calls.context.CallPosition
@@ -35,14 +36,14 @@ import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue
 import org.jetbrains.kotlin.synthetic.SyntheticJavaPropertyDescriptor
 
 object ProtectedSyntheticExtensionCallChecker : CallChecker {
-    fun computeSuitableDescriptorAndError(
+    private fun computeSuitableDescriptorAndError(
         descriptor: SyntheticJavaPropertyDescriptor,
         reportOn: PsiElement,
         context: CallCheckerContext
     ): Pair<FunctionDescriptor, DiagnosticFactory3<PsiElement, DeclarationDescriptor, DescriptorVisibility, DeclarationDescriptor>> {
         val callPosition = context.resolutionContext.callPosition
         val isLeftSide = callPosition is CallPosition.PropertyAssignment
-                && (callPosition.leftPart as? KtDotQualifiedExpression)?.selectorExpression == reportOn
+                && (callPosition.leftPart as? KtQualifiedExpression)?.selectorExpression == reportOn
         val getMethod = descriptor.getMethod
         val setMethod = descriptor.setMethod
         val isImprovingDiagnosticsEnabled =
diff --git a/compiler/testData/diagnostics/tests/properties/kt47621.fir.kt b/compiler/testData/diagnostics/tests/properties/kt47621.fir.kt
new file mode 100644
index 00000000000..e603263149d
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/properties/kt47621.fir.kt
@@ -0,0 +1,23 @@
+// WITH_STDLIB
+
+// FILE: j/J.java
+package j;
+
+public class J {
+    public int getX() { return 1; }
+    protected void setX(int value) { throw new RuntimeException(); }
+}
+
+// FILE: main.kt
+import j.*
+
+class C : J() {
+    fun foo() {
+        <!INVISIBLE_SETTER!>J()<!UNNECESSARY_SAFE_CALL!>?.<!>x<!> = 1
+    }
+}
+
+fun box(): String {
+    C().foo()
+    return "OK"
+}
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/properties/kt47621.kt b/compiler/testData/diagnostics/tests/properties/kt47621.kt
new file mode 100644
index 00000000000..96c252c73f3
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/properties/kt47621.kt
@@ -0,0 +1,23 @@
+// WITH_STDLIB
+
+// FILE: j/J.java
+package j;
+
+public class J {
+    public int getX() { return 1; }
+    protected void setX(int value) { throw new RuntimeException(); }
+}
+
+// FILE: main.kt
+import j.*
+
+class C : J() {
+    fun foo() {
+        J()<!UNNECESSARY_SAFE_CALL!>?.<!><!INVISIBLE_SETTER!>x<!> = 1
+    }
+}
+
+fun box(): String {
+    C().foo()
+    return "OK"
+}
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/properties/kt47621.txt b/compiler/testData/diagnostics/tests/properties/kt47621.txt
new file mode 100644
index 00000000000..899b4007e53
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/properties/kt47621.txt
@@ -0,0 +1,25 @@
+package
+
+public fun box(): kotlin.String
+
+public final class C : j.J {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun getX(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    protected/*protected and package*/ open override /*1*/ /*fake_override*/ fun setX(/*0*/ value: kotlin.Int): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+package j {
+
+    public open class J {
+        public constructor J()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open fun getX(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        protected/*protected and package*/ open fun setX(/*0*/ value: kotlin.Int): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
index 81add57ff9e..e589ad99d5e 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
@@ -24158,6 +24158,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/properties/extensionPropertyMustHaveAccessorsOrBeAbstract.kt");
             }
 
+            @Test
+            @TestMetadata("kt47621.kt")
+            public void testKt47621() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/properties/kt47621.kt");
+            }
+
             @Test
             @TestMetadata("lateinitOnTopLevel.kt")
             public void testLateinitOnTopLevel() throws Exception {