From ef8f3705f36d4376162d50d2f11bd9130f923b65 Mon Sep 17 00:00:00 2001
From: mikomyazaki <47489928+mikomyazaki@users.noreply.github.com>
Date: Sat, 22 Aug 2020 03:48:31 +0100
Subject: [PATCH] Prevents mapping multiple turfs per tile (#9703)

---
 code/modules/maps/reader.dm            | 7 ++-----
 html/changelogs/prevent_multiturfs.yml | 6 ++++++
 2 files changed, 8 insertions(+), 5 deletions(-)
 create mode 100644 html/changelogs/prevent_multiturfs.yml

diff --git a/code/modules/maps/reader.dm b/code/modules/maps/reader.dm
index d7d995f344c..c36fd070540 100644
--- a/code/modules/maps/reader.dm
+++ b/code/modules/maps/reader.dm
@@ -300,7 +300,7 @@ var/global/dmm_suite/preloader/_preloader = new
 		if(use_preloader && instance)
 			_preloader.load(instance)
 
-	//then instance the /turf and, if multiple tiles are presents, simulates the DMM underlays piling effect
+	//then instance the /turf
 
 	var/first_turf_index = 1
 	while(!ispath(members[first_turf_index], /turf)) //find first /turf object in members
@@ -314,12 +314,9 @@ var/global/dmm_suite/preloader/_preloader = new
 		T = instance_atom(members[first_turf_index],members_attributes[first_turf_index],crds,no_changeturf)
 
 	if(T)
-		//if others /turf are presents, simulates the underlays piling effect
 		index = first_turf_index + 1
 		while(index <= members.len - 1) // Last item is an /area
-			var/underlay = T.appearance
-			T = instance_atom(members[index],members_attributes[index],crds,no_changeturf)//instance new turf
-			T.underlays += underlay
+			crash_with("Tried to load additional turf at [model_key].")
 			index++
 
 	//finally instance all remainings objects/mobs
diff --git a/html/changelogs/prevent_multiturfs.yml b/html/changelogs/prevent_multiturfs.yml
new file mode 100644
index 00000000000..66595c9731c
--- /dev/null
+++ b/html/changelogs/prevent_multiturfs.yml
@@ -0,0 +1,6 @@
+author: mikomyazaki
+
+delete-after: True
+
+changes: 
+  - backend: "Prevents mapping multiple turfs per tile."
\ No newline at end of file