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2D area walkable by tag/layer

I am working with a 2D grid graph with tilemap, and I wanted to make some agents move ONLY through wall tiles. My idea was to scan a graph making only wall tiles walkable by their tag/layer, but I can’t find any way to do that.

Is this possible, or is there a workaround to achieve this? I am working with the free A* Pathfinding, version 4.2.17.