1 files changed, 2 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/timestamp.rb b/activerecord/lib/active_record/timestamp.rb
index e0541b7681..7178bed560 100644
--- a/activerecord/lib/active_record/timestamp.rb
+++ b/activerecord/lib/active_record/timestamp.rb
@@ -37,8 +37,8 @@ module ActiveRecord
     end
 
     def initialize_dup(other) # :nodoc:
-      clear_timestamp_attributes
       super
+      clear_timestamp_attributes
     end
 
   private
@@ -71,7 +71,7 @@ module ActiveRecord
     end
 
     def should_record_timestamps?
-      self.record_timestamps && (!partial_writes? || changed? || (attributes.keys & self.class.serialized_attributes.keys).present?)
+      self.record_timestamps && (!partial_writes? || changed?)
     end
 
     def timestamp_attributes_for_create_in_model