Static Nav Mesh works in editor but not in Packaged Build (4.27)

I have a project I updated from 4.17 to 4.27. It’s finally up and running and most things work, but the biggest issue currently is the nav meshes are not staying built for the packaged game. This is the same result for development and shipping builds.

In development build, console command “show navigation” reveals no nav mesh.

The nav is static, and I run Build Paths, then save the P map. This used to work in the past. When I reopen the level, the nav is still there.

I’ve tried deleting saved/intermediate folders, rebuilding the project in VS, various project and world settings,

I’m starting to lose my mind. Anyone have any ideas?