Whole NavMesh tiles turning red when using small obstacles?

So I have a character running along strips of NavMesh and to prohibit the character from being able to turn around I wanted to have a NavObstacle following it with a Dynamic generation of the NavMesh. But as soon as the Obstacle enters a Navigation Tile that Tile turns red which messes up the AI’s navigation completely. since it no longer sees the small obstacle behind it, but instead sees a whole unusable Tile under it or behind it. Why can’t I move small Obstacles with a Dynamic NavMesh? Why does the whole Tile become red?