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Navmesh hole problem
Hi!
i wounder why the Player and NPCs can walk outside and around the navmesh hole? 
//Malte
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"NavMesh holes" that are not entirely inside the boundary of the NavMesh are not always reliable - Unity will combine the two but the results may vary.
In general, they should only be used to cut out exact holes - not as a subtraction tool for geometry on the edges. You can see how Unity's updated the NavMesh by viewing the Scene window at runtime.
For the pipe and long wall in your video, a single NavMesh with points that surround them should be enough - no need for an extra hole polygon.