I think i get why vehicles in goodwood cant cross the rail @ either under or overpass
It has more to with ai than navmesh, although that plays a factor.
Bots used to only reverse slightly to try a path again, now they reverse all the way, making whatever initial attempt completely nullified, so unless they make the pass in 1 take, they will try n try again forever.
That said, didnt goodwood have multiple paths across the rail itself? I recall winterhilf adding those along with removing the barnhouse spawn.
Also, i recall drawde making vehicles push against dodgy paths rather than reverse. dont know if @ some point they gave up and tried again, but i recall that system worked wonders in goodwood especially - could we try that and see? Drawde, Remick?