Fixing

Content.Server/_NF/SizeAttribute/SizeAttributeSystem.cs

@@ -3,7 +3,7 @@
 using Robust.Shared.Physics;
 using Robust.Shared.Physics.Collision.Shapes;
 using Robust.Shared.Physics.Systems;
-using Content.Server.Item.PseudoItem;
+using Content.Shared.Item.PseudoItem;
 
 namespace Content.Server.SizeAttribute
 {

Content.Shared/Nyanotrasen/Item/Components/PseudoItemComponent.cs

@@ -1,12 +1,12 @@
+using Content.Shared._NF.Cloning;
 
 namespace Content.Shared.Item.PseudoItem;
-
 /// <summary>
 /// For entities that behave like an item under certain conditions,
 /// but not under most conditions.
 /// </summary>
 [RegisterComponent]
-public sealed partial class PseudoItemComponent : Component
+public sealed partial class PseudoItemComponent : Component, ITransferredByCloning
 {
     [DataField("size")]
     public int Size = 120;

Content.Shared/Nyanotrasen/Item/PseudoItemInsertDoAfterEvent.cs

@@ -0,0 +1,10 @@
+using Robust.Shared.Serialization;
+using Content.Shared.DoAfter;
+
+namespace Content.Shared.Item.PseudoItem;
+
+
+[Serializable, NetSerializable]
+public sealed partial class PseudoItemInsertDoAfterEvent : SimpleDoAfterEvent
+{
+}