Pipboy map shows invalid path to quest marker

[Belthan]

Anybody know how the Pip Boy map calculates the path to a quest objective? When the objective is in a location that requires the player to pass through one or more intermediate cells, I believe the map usually shows those hops. However, I have a quest marker like that, and the Pip Boy map just shows a (deceptive) straight line from the player's location to the objective. I would prefer that it show a line to the portal of the interior cell through which the player must pass to reach the objective. All intermediate cells are properly navmeshed with accessible portals and finalized.

[Hopper31]

Here is what I would do: Put a trigger in one of those intermediate cells and attach the marker to it. Then once the player reaches it have it update the quest marker to the next/final area.