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Issue #29901: Jamaica Plain Navmeshing Issues
To make NPC use preferred paths (or, actually, to make them prefer them, because they will never use them exclusively), this behaviour must be enabled by setting individual bools on the procedures their packages are composed of [NB: you'll find them on the "package" tab of the packages, not on the "Flags" tab; the latter is only for flags that apply to the whole package]. All these bools however are false on all workshop packages (except those of the provisioners), so I have my doubts that preferred pathing is the issue here. It's more likely a pathfinding issue where the way around the buildings at the northern edge of the settlement is the shortest possible path to reach the intended destination - and such an issue can be easily explained by the navmesh gap at the stairs because it blocks the way across the settlement permanently.
In similar situations, settlers are not using the preferred path. If I build a guard post just west of the stairs with the navmesh gap and another one on the bend of the road along the southern side of the settlement (i.e. just south of the other stairs; west of this point, the road trends from northwest to southeast, then turns to the east), my guard takes the path across the building. This is the shortest path. The preferred path runs along the road on the west side, around the southwest corner, and then along the southern road. To make him use that, I have to move the guard post significantly further west, i.e. he walks on that path only if it is shorter than the way across the building.
Thus, I fixed the gap but did not touch the preferred pathways. I also grounded two vertices that were floating way above the ground a little west of the blocked stairs. The triangles connected to these vertices (or at least parts of them) are an obstacle for NPCs and cannot be navigated through [navmeshes are best placed directly on the ground; they may be floating or buried a little but once they are floating too far above the ground or buried to deep below it, they will stop working properly]. I also added a precut mesh to the news stand 00095383 (it didn't have one and therefore left a permanent gap in the navmesh when it was scrapped).
In similar situations, settlers are not using the preferred path. If I build a guard post just west of the stairs with the navmesh gap and another one on the bend of the road along the southern side of the settlement (i.e. just south of the other stairs; west of this point, the road trends from northwest to southeast, then turns to the east), my guard takes the path across the building. This is the shortest path. The preferred path runs along the road on the west side, around the southwest corner, and then along the southern road. To make him use that, I have to move the guard post significantly further west, i.e. he walks on that path only if it is shorter than the way across the building.
Thus, I fixed the gap but did not touch the preferred pathways. I also grounded two vertices that were floating way above the ground a little west of the blocked stairs. The triangles connected to these vertices (or at least parts of them) are an obstacle for NPCs and cannot be navigated through [navmeshes are best placed directly on the ground; they may be floating or buried a little but once they are floating too far above the ground or buried to deep below it, they will stop working properly]. I also added a precut mesh to the news stand 00095383 (it didn't have one and therefore left a permanent gap in the navmesh when it was scrapped).
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