After further iteration Ive reproed it even when the IsValid is hooked up properly. It seems to happen when the nav mesh is stale and refuses to rebuild properly. Reloading the map and rebuilding paths seems to resolve it. There is definitely bugs with navmesh rebuilding, like I have seen the navmesh double up after rebuilding geometry, and rebuilding paths doesn’t appear to force a rebuild and will naively reuse existing. One notable thing I saw was deletion of nav modifer volume did not remove its affect on the navmesh even after rebuilding geo/paths, it did not clear until I reloaded the map and rebuilt again.
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