NavMesh link does not connect properly on runtime

I am using the latest version of Unity 2017.1f1 currently up-to-date.

What I am trying to do

In my 2.5D game, I am spawning enemies that will navigate towards the player while avoiding obstacles (with curving enabled) spawned in runtime. I also spawn a plane (on which the player and enemies moves) additively, I want the current plane navMesh surface to connect to the next spawned plane navMesh surface with a navMesh link so that the enemies can navigate to other planes via the link.

What is the Problem?

There are two issues happening:

1. The link closer to the obstacle whose curving is enabled do not get connected to the next plane.

2. Since the player can run right and left I rotate the plane according to the direction the player is facing, however rotating the plane at 180 degrees, while it's direction is equal to Vector3.Down (which is (0,-1,0)) the navMesh links on that plane do not connect to its neighboring planes in runtime.

My Implementation

First of all, I am using the navMesh components provided by Unity on GitHub to achieve this in runtime. Now when I spawn the plane additively I first build the navMesh surface then update its attached links.

 nextPlaneSurface.BuildNavMesh();
 for (int i = 0; i < nextPlaneLinks.Length; i++) {
     nextPlaneLinks[i].UpdateLink();
 }

Next, I update the current plane (which the player is on) navMesh links to connect with the newly spawned plane navMesh surface.

 for (int i = 0; i < currPlaneLinks.Length; i++) {
     currPlaneLinks[i].UpdateLink();
 }

What I have tried to fix the problem

For the first problem:-

• Updating the current links and rebuilding the navMesh before and after spawning the obstacles.

• Updating only the current links before and after spawning the obstacles.

For the second problem:-

• I am out of clues, I have no idea what's causing this :(

Will really appreciate if anyone can help me out, also if you guys can explain what's happening internally in the unity scripts that will be really helpful. After all, I am having these problems because I don't understand the concept properly.