Add comment to explain unusual fix

app/models/spree/line_item_decorator.rb

@@ -71,8 +71,10 @@ Spree::LineItem.class_eval do
       where('spree_adjustments.id IS NULL')
   }
 
+  # Overridden so that LineItems always have access to soft-deleted Variant attributes
+  # In some situations, unscoped super will be nil, in these cases we fetch the variant using the variant_id
+  # See isssue #4946 for more details
   def variant
-    # Overridden so that LineItems always have access to soft-deleted Variant attributes
     Spree::Variant.unscoped { super } || Spree::Variant.unscoped.find(self.variant_id)
   end