Occluder doesnt occlude itself

Hey everyone, question time since im struggling with optimzing our scene for DrawCalls and such. I identified that our Timber Houses are the culprit why half the level is not occluded so i isolated them in an almost empty scene.

We then have the following simplified setup with the Timber Houses:

The Timber Houses (Modular meshes on the left one, grouped Actor on the right one) are supposed to occlude the white left boxes and the 2nd house when being too close to the a wall of the right house.

From this POV i then froze the rendering during gameplay:

Then walked around only to notice that the Timber walls are properly occluding the white Boxes, but not the very same thing (2nd house, some other objects such as the trash cans as well?). Is there a setting im forgetting about? The assumption is that houses can occlude other houses.

Any ideas or pointers? :slight_smile:

In addition - the meshes of the timber house seem to have proper actor bounds as well: