diff --git a/CHANGELOG b/CHANGELOG
index 21d6c76..2efad0d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,7 @@
 = Change Log
 
 == 0.8.0
+* Ensure that the DelegatingOpenStruct is a true copy of the original [saturnflyer]
 * Avoid errors with frozen strings in Ruby 3.4+ [jeremyevans]
 * Drop support for EOL versions of Ruby
 
diff --git a/lib/radius/context.rb b/lib/radius/context.rb
index 97096cd..211ebb9 100644
--- a/lib/radius/context.rb
+++ b/lib/radius/context.rb
@@ -96,7 +96,7 @@ def dup # :nodoc:
       def stack(name, attributes, block)
         previous = @tag_binding_stack.last
         previous_locals = previous.nil? ? globals : previous.locals
-        locals = DelegatingOpenStruct.new(previous_locals)
+        locals = previous_locals.dup
         binding = TagBinding.new(self, locals, name, attributes, block)
         @tag_binding_stack.push(binding)
         result = yield(binding)
diff --git a/lib/radius/delegating_open_struct.rb b/lib/radius/delegating_open_struct.rb
index 1a95bee..17a3196 100644
--- a/lib/radius/delegating_open_struct.rb
+++ b/lib/radius/delegating_open_struct.rb
@@ -8,30 +8,26 @@ def initialize(object = nil)
     end
 
     def dup
-      rv = self.class.new
-      rv.instance_variable_set(:@hash, @hash.dup)
-      rv
+      self.class.new.tap do |copy|
+        copy.instance_variable_set(:@hash, @hash.dup)
+        copy.object = @object
+      end
     end
     
     def method_missing(method, *args, &block)
-      symbol = (method.to_s =~ /^(.*?)=$/) ? $1.intern : method
-      if (0..1).include?(args.size)
-        if args.size == 1
-          @hash[symbol] = args.first
-        else
-          if @hash.has_key?(symbol)
-            @hash[symbol]
-          else
-            unless object.nil?
-              @object.send(method, *args, &block)
-            else
-              nil
-            end
-          end
-        end
+      return super if args.size > 1
+      
+      symbol = method.to_s.chomp('=').to_sym
+      
+      if method.to_s.end_with?('=')
+        @hash[symbol] = args.first
       else
-        super
+        @hash.fetch(symbol) { @object&.public_send(method, *args, &block) }
       end
     end
+
+    def respond_to_missing?(method, include_private = false)
+      (args.size <= 1) || super
+    end
   end
 end
diff --git a/lib/radius/utility.rb b/lib/radius/utility.rb
index aab4874..d409575 100644
--- a/lib/radius/utility.rb
+++ b/lib/radius/utility.rb
@@ -22,15 +22,12 @@ def self.constantize(camelized_string)
     end
     
     def self.camelize(underscored_string)
-      string = ''
-      underscored_string.split('_').each { |part| string << part.capitalize }
-      string
+      underscored_string.split('_').map(&:capitalize).join
     end
 
     def self.array_to_s(c)
-      c.map do |x|
-        res = (x.is_a?(Array) ? array_to_s(x) : x.to_s)
-        +res
+      +c.map do |x|
+        x.is_a?(Array) ? array_to_s(x) : x.to_s
       end.join
     end
   end
diff --git a/test/context_test.rb b/test/context_test.rb
index 537468b..201fac9 100644
--- a/test/context_test.rb
+++ b/test/context_test.rb
@@ -35,6 +35,14 @@ def test_initialize_with_arguments
     assert_equal 'arg', @context.name
   end
   
+  def test_dup_preserves_delegated_values
+    @context = Radius::Context.new
+    @context.globals.object = Object.new.tap { |o| def o.special_method; "special"; end }
+    duped = @context.dup
+
+    assert_equal "special", duped.globals.special_method, "Duped context should preserve delegated object methods"
+  end
+
   def test_with
     got = @context.with do |c|
       assert_equal @context, c
diff --git a/test/multithreaded_test.rb b/test/multithreaded_test.rb
index 961f1d9..947a691 100644
--- a/test/multithreaded_test.rb
+++ b/test/multithreaded_test.rb
@@ -26,12 +26,17 @@ def test_runs_multithreaded
         local_results = []
         iterations_per_thread.times do
           begin
-            parser = Radius::Parser.new(@context, :tag_prefix => 'r')
+            thread_context = @context.dup
+            parser = Radius::Parser.new(thread_context, :tag_prefix => 'r')
             parser.context.globals.thread_id = Thread.current.object_id
             expected = "#{Thread.current.object_id} / #{parser.context.globals.object_id}"
             result = parser.parse('<r:thread />')
 
-            local_results << result
+            local_results << {
+              result: result,
+              thread_id: Thread.current.object_id,
+              iteration: local_results.size
+            }
 
             failures << "Expected: #{expected}, Got: #{result}" unless result == expected
           rescue => e
@@ -48,12 +53,26 @@ def test_runs_multithreaded
     failure_message = if failures.empty?
       nil
     else
-      "Thread failures detected:\n#{failures.size} times:\n#{failures.pop(5).join("\n")}"
+      failed_items = []
+      5.times { failed_items << failures.pop unless failures.empty? }
+      "Thread failures detected:\n#{failures.size} times:\n#{failed_items.join("\n")}"
     end
 
     assert(failures.empty?, failure_message)
     total_results = results.flatten.uniq.size
     expected_unique_results = thread_count * iterations_per_thread
+
+    if total_results != expected_unique_results
+      duplicates = results.flatten.group_by { |r| r[:result] }
+                         .select { |_, v| v.size > 1 }
+
+      puts "\nDuplicates found:"
+      duplicates.each do |result, occurrences|
+        puts "\nResult: #{result[:result]}"
+        occurrences.each { |o| puts "  Thread: #{o[:thread_id]}, Iteration: #{o[:iteration]}" }
+      end
+    end
+
     assert_equal expected_unique_results, total_results,
       "Expected #{expected_unique_results} unique results (#{thread_count} threads × #{iterations_per_thread} iterations)"
   end