The ground material "a3\map_enoch\data\gdt_entarmacold_co.paa" was removed from the game files on recent update.
This texture was a ground material option in "Game realistic map maker" as a common choice used by map makers for their runways, but after it was removed from the game files - any map using this texture now throws an error and has missing runways.
See attached photos.
In it's current state, it is unlikely most map makers would come back to fix this on their maps and update them with a solution. Including my own, where I no longer have access to the original files.
In the attached photos you can see how the runways look now.
`Warning Message: Cannot load texture a3\map_enoch\data\gdt_entarmacold_co.paa.`