Force expansion to have the same nullability as abbreviation

Note that classifier.underlyingType is always non-nullable, but
abbreviation might be nullable, so we should keep them consistent

^KT-40199 Fixed

native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/builder/builderUtils.kt

@@ -131,7 +131,7 @@ internal fun CirSimpleType.buildType(
     )
 
     return if (classifier is TypeAliasDescriptor)
-        classifier.underlyingType.withAbbreviation(simpleType)
+        classifier.underlyingType.makeNullableAsSpecified(simpleType.isMarkedNullable).withAbbreviation(simpleType)
     else
         simpleType
 }