forgot to mention: the fix is based on the patch by Nat from IDEA-25679

platform/lang-api/src/com/intellij/psi/stubs/DefaultStubBuilder.java

@@ -74,7 +74,6 @@ public class DefaultStubBuilder implements StubBuilder {
         }
       }
     }
-
     return parentStub;
   }
 
@@ -123,4 +122,4 @@ public class DefaultStubBuilder implements StubBuilder {
   public boolean skipChildProcessingWhenBuildingStubs(@Nullable ASTNode parent, IElementType childType) {
     return false;
   }
-}
+}