Hello, I will give you a few tips, found during development with occluders.

First, the occluder should be a map object, so baked in and binarized with him.
Second, it needs to be inside the geometry limit.
Third, it does not occlude object inside the occluder itself, but occlude object on the other side of the occluder, if you enter in this occluder, it will not occlude anything anymore.
Fourth, The occluder should not be too big like this, it should represent a real object that you want to place.
Fifth, The occluder should not be named as a ComponentXX, or it will bug any view geometry interaction inside the model.

I think I gave you all the tips, I have found during developing with an occluder. But I can tell you all my occluder works like a charm.

This a link, where you have some information about occluder: https://community.bistudio.com/wiki/Geometric_Occluders

Hello.
NiiRoZz:

1. I know it, and my model inside map.
2. Works and outside, you can watch this in video. But and inside geometry have same defect.
3. Occluded inside, as you can see in the video, but it depends on the direction of the look
4. I also thought, but small one has exactly the same problems.
5. Yes, I know, I read wiki before doing this, and I followed all the rules.

Sorry for my English.

Geez:
https://youtu.be/geA91DIbwGY (test with small occluder)

Hello nIkRon.
We have checked the model you have provided and there doesn't seem to be an issue with it.

Rendering of a port garage in Chernarus, this is the last frame of loading models.

1.0: here the fences and other buildings behind the wall were loaded when they were not supposed to.
1.1: https://cdn.discordapp.com/attachments/722784637968973956/722796151329390602/unknown.png
1.2: https://cdn.discordapp.com/attachments/722784637968973956/722796338193891390/unknown.png

2.0: and here only a few objects not occluded, but the fences are gone.
2.1: https://cdn.discordapp.com/attachments/722784637968973956/722797577925427370/unknown.png
2.2: https://cdn.discordapp.com/attachments/722784637968973956/722797608552366160/unknown.png

Yes, the model is normal, but you see that sometimes objects do not occluded, i think its engine bug.
more video: https://youtu.be/k8iPXdpO2Mw

@Geez, I've reported this in the past, in fact, because players can abuse it to see through walls. It is an engine bug.

@Geez look at this, it does not work correctly.
Video:

Model:

I noticed that such a gap in the middle of the occluder is created due to the fact that the occluder is triangulated, if you use a Quads, it becomes better, but still does not work correctly.
And this gap is obtained on the edges.

@nlkRon, thanks for giving them these details. Hopefully this will finally get fixed.