Map fix and hypothetical holodeck fix for UL

code/defines/procs/helpers.dm

@@ -1595,15 +1595,19 @@ proc/DuplicateObject(obj/original, var/perfectcopy = 0 , var/sameloc = 0)
 	var/list/turfs_src = get_area_turfs(src.type)
 	var/list/turfs_trg = get_area_turfs(A.type)
 
+	var/blanked_turfs = list()
+
 	var/src_min_x = 0
 	var/src_min_y = 0
 	for (var/turf/T in turfs_src)
+		blanked_turfs |= T.ul_BlankLocal()
 		if(T.x < src_min_x || !src_min_x) src_min_x	= T.x
 		if(T.y < src_min_y || !src_min_y) src_min_y	= T.y
 
 	var/trg_min_x = 0
 	var/trg_min_y = 0
 	for (var/turf/T in turfs_trg)
+		blanked_turfs |= T.ul_BlankLocal()
 		if(T.x < trg_min_x || !trg_min_x) trg_min_x	= T.x
 		if(T.y < trg_min_y || !trg_min_y) trg_min_y	= T.y
 
@@ -1707,6 +1711,7 @@ proc/DuplicateObject(obj/original, var/perfectcopy = 0 , var/sameloc = 0)
 
 
 	var/list/doors = new/list()
+	ul_UnblankLocal(blanked_turfs)
 
 	if(toupdate.len)
 		for(var/turf/simulated/T1 in toupdate)