I can see they are somewhat working, because there are seams on the roads, delineating them. But it seems no matter what I do it does not set any areas for the navmesh.
In the non-beta version the recast mesh obj cannot set tags on the navmesh. However in the beta version it can. You can download the beta version here: A* Pathfinding Project
Ah, I will try downloading it, it unfortunately requires a higher version of the burst compiler, and the burst package is not cooperating with me right now.