Adjusting Agent Radius in RecastNavMesh causes AI to not move

Adjusting the RecatNavMesh in a map can cause the AI to not move when simulating or playing in viewport. Setting it back to the default value does not fix the issue.

I can only reproduce this with an AI character I created in QAGame (CharMove_AI). I can't seem to repro with any other AI character.

1. Launch UE4Editor.exe QAGame.
2. Open the level WIP_FTest_CharacterMovement.
3. In the World Outliner, select RecastNavMesh-Main.
4. In the Details panel, set Agent Radius to 10.
5. Simulate.

RESULT:

The AI characters do not move.