diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/CommonizerHierarchicalIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/CommonizerHierarchicalIT.kt
index 736c307e276..da11b6ecdf7 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/CommonizerHierarchicalIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/CommonizerHierarchicalIT.kt
@@ -153,6 +153,16 @@ class CommonizerHierarchicalIT : BaseGradleIT() {
         }
     }
 
+    @Test
+    fun `test KT-52050 - DIR retains CPointed supertype`() {
+        with(Project("commonize-kt-52050-DIR-supertype")) {
+            build(":compileCommonMainKotlinMetadata") {
+                assertNotContains("Unresolved reference")
+                assertSuccessful()
+            }
+        }
+    }
+
     private object Os {
         private val os = OperatingSystem.current()
         val canCompileApple get() = os.isMacOsX
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-52050-DIR-supertype/build.gradle.kts b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-52050-DIR-supertype/build.gradle.kts
new file mode 100644
index 00000000000..a3a543c9d8b
--- /dev/null
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-52050-DIR-supertype/build.gradle.kts
@@ -0,0 +1,24 @@
+plugins {
+    kotlin("multiplatform")
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+kotlin {
+    macosX64("macos")
+    linuxX64("linux")
+    mingwX64("windows")
+
+    val commonMain by sourceSets.getting
+    val macosMain by sourceSets.getting
+    val linuxMain by sourceSets.getting
+
+    val unixMain by sourceSets.creating
+
+    unixMain.dependsOn(commonMain)
+    linuxMain.dependsOn(unixMain)
+    macosMain.dependsOn(unixMain)
+}
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-52050-DIR-supertype/src/commonMain/kotlin/CommonMain.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-52050-DIR-supertype/src/commonMain/kotlin/CommonMain.kt
new file mode 100644
index 00000000000..56084734fc2
--- /dev/null
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-52050-DIR-supertype/src/commonMain/kotlin/CommonMain.kt
@@ -0,0 +1,17 @@
+@file:Suppress("UNUSED_PARAMETER")
+
+import kotlinx.cinterop.CPointed
+import platform.posix.DIR
+
+fun requireCPointed(value: CPointed): Unit = error("Not supported")
+fun DIR(): DIR = error("Not supported")
+
+fun main() {
+    /*
+    Linux and Windows Hosts failed to retain
+    CPointed supertype of `DIR` when commonizing.
+    This happened in the special case of 'single platform propagation', which
+    lost forward declarations from one step to the next.
+     */
+    requireCPointed(DIR())
+}