Lots of details on the related UDN thread. In short, Navigation System is not handling properly deep component hierarchies.
I've added a test map for this to AIProject, it's ComponentHierarchyOnNavmesh. All one has to do to repro the bug is to move the red-colored component by typing in new location/rotation/scale.
error message when install in U.E 5.3 - IS-IN-FCO2-82
I am not able to find world outliner how to enable it?
How can i modify the param name in EQS node
Undefined sysmbol: typeinfo for AActor when cross-compile linux dedicated server on windows
How to capture a screen Use CineCameraComponent without SceneComponent2d
Delay nodes occasionally don't fire the "Completed" output in a nativized build
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-20125 in the post.