Adds Multi-Z Test Map

code/game/objects/effects/effect_system.dm

@@ -333,7 +333,7 @@ steam.start() -- spawns the effect
 			spawn(0)
 				var/turf/T = get_turf(src.holder)
 				if(T != src.oldposition)
-					if(istype(T, /turf/space))
+					if(istype(T, /turf/simulated))
 						var/obj/effect/effect/ion_trails/I = PoolOrNew(/obj/effect/effect/ion_trails, src.oldposition)
 						src.oldposition = T
 						I.set_dir(src.holder.dir)

code/game/objects/structures/lattice.dm

@@ -34,6 +34,11 @@
 		if(locate(/obj/structure/lattice, get_step(src, dir)))
 			L = locate(/obj/structure/lattice, get_step(src, dir))
 			L.updateOverlays(src.loc)
+	if(istype(loc, /turf/simulated/open))
+		var/turf/simulated/open/O = loc
+		spawn(1)
+			if(O) // If we built a new floor with the lattice, the open turf won't exist anymore.
+				O.update() // This lattice may be supporting things on top of it.  If it's being deleted, they need to fall down.
 	..()
 
 /obj/structure/lattice/ex_act(severity)