How to stop Nav Mesh Volumes automatically merging?

Hello I have a lever where I have two brachiosaurus, each with their own nav mesh volume.

As you can see, there is a gap between the two nav mesh volume to keep the brachiosaurus from entering each other’s area. But I want to extend the Nav mesh volume a bit, the gap between them is too huge and wastes space for the brachiosaurus to walk on.

The problem is if I increase the size Nav Mesh volume just a bit, both Nav Mesh Volumes automatically merge and remove the gap completely. Is there a way to get the Nav Mesh Volumes closer to each other without merging them? Any response is appreciated. Thank you.

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Have you found any solution to this?

If you are still looking (and any future people come along for an answer):

NavModifierVolume

Same thing as a NavMeshBounds but inverted to act as a wall. Just place it between your volumes and they won’t combine (also works as invisible walls inside the volume if you need that).