Pathfinding in Infidelities quest from Tribunal addon is broken

Pathfinding for Taren Andoren from Infidelities quest behaves in a strange way when navigator is enabled:

1. He tries to shortcut over almost vertical platform and can stuck at it. Interesting that "short" path can actually be longer than "long" path over pathgrid:

2. Sometimes he can not reach target area and walks in place, because the destination is occupied by an another actor. We have a workaround for this issue for classic pathfinding since 0.45 (a threshold to target, but not for navmeshes:

This bug happens at least with 0.47 and 0.48.