Binarizing terrain WRP requires config.cpp namely class CfgWorlds to be present in the same directory as the WRP file otherwise all vegetation (trees and rocks) foliage will not work in-game map (M) view.

Early 2017 Mikero changed pboProject to give warning (not an error, a warning) about this issue. Since then many people were scratching their heads of whats up as their WRP data + config were separated to two different pbos.

Early August 2017 Mikero again changed pboProject to warn you about missing worldName in config next to WRP file.

This can be fixed / avoided by adding dummy config to the pbo where your WRP file is located.

Terrain dummy config with WRP file:

class CfgPatches
{
	class PMC_iraq_baghdad_wrp
	{
		units[] = {};
		weapons[] = {};
		requiredVersion = 1;
		requiredAddons[] =
		{
			"A3_Map_Stratis"
		};
	};
};
 
class CfgWorlds
{
	class Stratis;
	class PMC_iraq_baghdad: Stratis
	{
		// pboProject requires
		worldName = "\pmc\pmc_iraq_baghdad\pmc_iraq_baghdad.wrp";
 
		// arma3 requires for forests to appear in mapview (M)
		minTreesInForestSquare = 2;
		minRocksInRockSquare = 2;
	};
};

This would require no additions to your normal <TERRAIN_NAME>_cfg config.cpp entry as you obviously are already using “PMC_iraq_baghdad_wrp” as requiredAddons[] entry.

Credits from this dummy config goes to kju!