Navigation broken only on one map

So I’ve never had problems with navigation before, my enemies have always worked just fine. Started blocking out a new map yesterday, was testing the AI as I went, they worked just fine. Then at some point, I broke something apparently. They are still in the navmesh bounds the ground is painted green just like it should be, but they all just stand there. And they all still work fine in every other map, so it’s not the AI, it’s something to do with this particular map, but no idea what it could be. I also tried switching them to using a Navigation Invoker component and same story, they work on every other map but this one. Any ideas? I’m stumped.

Seems like simply deleting the nav mesh and bringing in a fresh one solved the problem.