This is an old question, but perhaps I can still shine some light on it for other people researching the topic.
This Reddit thread suggests using Nav Links, in combination with a “Smart Link” option and force-teleport/lerping position of the Pawn once it reaches for a ladder. Basically, you’re breaking up pathing into two distinct parts: the moment before it hits the ladder, and the moment it exits the ladder. The ladder itself is not part of the NavMesh interaction technically, because the Pawn is momentarily disconnected from AI pathfinding as it’s “climbing” the ladder. After it exits the ladder, NavMesh pathfinding is resumed (by plotting a new path, so yes, a slight extra path-finding overhead is introduced).
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