When Two adjacent actors with hierarchical instance static mesh component cross the tile bound of navmesh, navmesh is broken. In screenshot.png, above is the normal Static Meshs, bellow is the Actors. You can find the breakage.

Steps to Reproduce
  1. Open and play ""
  2. Show navigation or push P

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ComponentUE - AI
Affects Versions4.15.1
Target Fix4.20
Fix Commit3897556
Main Commit3967553
Release Commit4095966
CreatedMay 22, 2017
ResolvedFeb 19, 2018
UpdatedJun 7, 2018