Fix cursed mask bug (#33014)

* One line fix

* Removed redundant using

* Allocation improvement

diff --git a/Content.Server/Clothing/Systems/CursedMaskSystem.cs b/Content.Server/Clothing/Systems/CursedMaskSystem.cs
index 825e85e2c600ccdab403e7fec10d2c30371fb3f5..86d4e801a8b000369f5f4e13e009e69c155cab24 100644 (file)
--- a/Content.Server/Clothing/Systems/CursedMaskSystem.cs
+++ b/Content.Server/Clothing/Systems/CursedMaskSystem.cs
@@ -51,7 +51,8 @@ public sealed class CursedMaskSystem : SharedCursedMaskSystem
         }
 
         var npcFaction = EnsureComp<NpcFactionMemberComponent>(wearer);
-        ent.Comp.OldFactions = npcFaction.Factions;
+        ent.Comp.OldFactions.Clear();
+        ent.Comp.OldFactions.UnionWith(npcFaction.Factions);
         _npcFaction.ClearFactions((wearer, npcFaction), false);
         _npcFaction.AddFaction((wearer, npcFaction), ent.Comp.CursedMaskFaction);