This is a known restriction of Detour crowd simulation that it uses only a single navmesh, in this case the default one.
Pawns using a DetourCrowdAIController do not appear to be using the correct Nav Agent when attempting to move.
Setting the AI Controller class to a normal AI Controller allows it to complete the same move successfully.
Result: Character does not move when using a DetourCrowdAIController
Expected: Behavior would be consistent between the two controller types, and the character would use the correct Nav Agent to navigate to the target point's location.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-45293 in the post.