Hi!
I use Navmesh pathfinding with these settings
It mostly works fine. Except when Player needs to move from the sharp corner. Or take sharp turn. It falls through the Navmesh like it doesn't know it's own dimensions. I captured the video to explain it better
Comments
The Player has to turn while moving, and doesn't rely on the NavMesh for collisions - only the path that it has to take as a set of discrete points. If you're having trouble with him falling off, place down additional colliders to act as the floor - generally speaking, shouldn't rely purely on the NavMesh to act as your floor collider as well.