rvoAgent.NeighbourObstacles never populated?

In my quest to keep RVOAgents on my graph I came across what I believe is a bug.

In RVOController.cs the wallAvoidForce variable never seems to be factored in because this line never returns a value:

List obst = rvoAgent.NeighbourObstacles; // Around line 288

I checked this by using RVONavmesh and creating a single square obstacle in the path of a dozen agents. While I end up with roughly 600 obstacles and my agents definitely run into the square obstacle and slow to get around it they never get any neighboring obstacles and the loop to calculate the wall avoidance force never gets entered.