NevMesh cuts out holes for collision incorrectly with Skeletal Meshes. Skeletal Meshes with "Can Ever Affect Navigation" set to true and that have a Physics Asset are capable of causing this.

Steps to Reproduce

1. Open the attached file in Main
2. Press 'P' in the viewport to see navmesh
3. Move Skeletal Meshes in the scene around

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ComponentUE - AI
Affects Versions4.7.24.8
Target Fix4.9
Fix Commit2572425
CreatedMar 16, 2015
ResolvedJun 1, 2015
UpdatedApr 27, 2018