Merge pull request #2438 from Citadel-Station-13/upstream-merge-30011

[MIRROR] Diseases will properly make new symptoms instead of sharing the same for everyone

code/datums/diseases/_MobProcs.dm

@@ -43,7 +43,7 @@
 		SSdisease.active_diseases += DD //Add it to the active diseases list, now that it's actually in a mob and being processed.
 
 		//Copy properties over. This is so edited diseases persist.
-		var/list/skipped = list("affected_mob","holder","carrier","stage","type","parent_type","vars","transformed")
+		var/list/skipped = list("affected_mob","holder","carrier","stage","type","parent_type","vars","transformed","symptoms")
 		for(var/V in DD.vars)
 			if(V in skipped)
 				continue

code/datums/diseases/advance/advance.dm

@@ -57,9 +57,7 @@
 			symptoms = GenerateSymptoms(0, 2)
 		else
 			for(var/datum/symptom/S in D.symptoms)
-				var/datum/symptom/new_symp = new S.type
-				new_symp.name = S.name
-				new_symp.neutered = S.neutered
+				var/datum/symptom/new_symp = S.Copy()
 				symptoms += new_symp
 
 	Refresh()