How to use link in layer grid graph?

General Grid graph
1
  • A* version: 5.4.5
  • Unity version: 2022.3.62f3c1

When I use link2 on the layered grid graph, I find that it is not working. The link2 is already a thick green line, which should have recognized the graph data. How do I adapt it?

I use AILerp and AIPath, both of them doesn’t work.