Merge pull request #4530 from Citadel-Station-13/upstream-merge-33705

[MIRROR] Turns the baseturf var into a part time list

code/game/objects/effects/effect_system/effects_foam.dm

@@ -76,7 +76,7 @@
 	if(metal)
 		var/turf/T = get_turf(src)
 		if(isspaceturf(T)) //Block up any exposed space
-			T.ChangeTurf(/turf/open/floor/plating/foam)
+			T.PlaceOnTop(/turf/open/floor/plating/foam)
 		for(var/direction in GLOB.cardinals)
 			var/turf/cardinal_turf = get_step(T, direction)
 			if(get_area(cardinal_turf) != get_area(T)) //We're at an area boundary, so let's block off this turf!

code/game/objects/effects/spawners/vaultspawner.dm

@@ -20,9 +20,9 @@
 		for(var/j = lowBoundY,j<=hiBoundY,j++)
 			var/turf/T = locate(i,j,z)
 			if(i == lowBoundX || i == hiBoundX || j == lowBoundY || j == hiBoundY)
-				T.ChangeTurf(/turf/closed/wall/vault)
+				T.PlaceOnTop(/turf/closed/wall/vault)
 			else
-				T.ChangeTurf(/turf/open/floor/vault)
+				T.PlaceOnTop(/turf/open/floor/vault)
 			T.icon_state = "[type]vault"
 
 	qdel(src)