AI cannot traverse Ladder. Help !

Hey all. This problem has been bugging me. Please help.
I have a nav mesh in my game. And a set of ladder. Somehow, the NavMesh doesn’t generate on the ladder no matter what I do (simple coll as complex or vice versa, convex collision or simple box ones, nothing works).
I have adjusted settings inside RecastNavMesh as well (such as step height or radius or slope) and even adjusted Walkable angle in AI Char BP but it doesn’t work. Finally I added Nav Link Proxies which also don’t work. Attaching some screenshots.


Ladder in my game


NavMesh and Nav proxies

I try to navigate the AI b/w those 2 Target points, hoping it’ll take the shortest path i.e the ladder but, if the AI is on the roof, he goes to the right of ladder. And from the ground, he just walks and tries to reach a point right beneath the target.

Below are the assets with collision.