Index: app/models/issue.rb
===================================================================
--- app/models/issue.rb	(revision 13127)
+++ app/models/issue.rb	(working copy)
@@ -960,7 +960,9 @@
       end
 
       # Add related issues to the queue, if they are not already in it.
-      current_issue.relations_from.map(&:issue_to).each do |related_issue|
+      current_issue.relations_from.each do |relation|
+        related_issue = relation.issue_to
+        next if ['copied_to', 'duplicates', 'relates'].include?(relation.relation_type)
         next if except.include?(related_issue)
 
         if (issue_status[related_issue] == eNOT_DISCOVERED)