diff --git a/app/models/concerns/dossier_clone_concern.rb b/app/models/concerns/dossier_clone_concern.rb
index 84b9ed481..84e288146 100644
--- a/app/models/concerns/dossier_clone_concern.rb
+++ b/app/models/concerns/dossier_clone_concern.rb
@@ -167,7 +167,7 @@ module DossierCloneConcern
     added_champs.each { _1.update_column(:dossier_id, id) }
 
     if updated_champs.present?
-      champs_index = filled_champs_public.index_by(&:public_id)
+      champs_index = champs.index_by(&:public_id)
       updated_champs.each do |champ|
         champs_index[champ.public_id]&.destroy!
         champ.update_column(:dossier_id, id)
diff --git a/app/tasks/maintenance/t20241216remove_non_unique_champs_task.rb b/app/tasks/maintenance/t20241216remove_non_unique_champs_task.rb
new file mode 100644
index 000000000..5ed7d6483
--- /dev/null
+++ b/app/tasks/maintenance/t20241216remove_non_unique_champs_task.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Maintenance
+  class T20241216removeNonUniqueChampsTask < MaintenanceTasks::Task
+    # Documentation: cette tâche supprime les champs en double dans un dossier
+
+    include RunnableOnDeployConcern
+    include StatementsHelpersConcern
+
+    def collection
+      Dossier.state_not_brouillon.includes(champs: true)
+    end
+
+    def process(dossier)
+      dossier.champs.filter { _1.row_id.nil? }.group_by(&:public_id).each do |_, champs|
+        if champs.size > 1
+          champs.sort_by(&:id)[1..].each(&:destroy)
+        end
+      end
+    end
+  end
+end
diff --git a/spec/models/concerns/dossier_clone_concern_spec.rb b/spec/models/concerns/dossier_clone_concern_spec.rb
index 7854b7438..f7bab0f47 100644
--- a/spec/models/concerns/dossier_clone_concern_spec.rb
+++ b/spec/models/concerns/dossier_clone_concern_spec.rb
@@ -378,11 +378,15 @@ RSpec.describe DossierCloneConcern do
       }
       let(:removed_champ) { dossier.champs.find { _1.stable_id == 99 } }
       let(:updated_champ) { dossier.champs.find { _1.stable_id == 991 } }
+      let(:repetition_updated_champ) { champ_for_update(dossier.champs.find { _1.stable_id == 994 }) }
+      let(:forked_updated_champ) { champ_for_update(forked_dossier.champs.find { _1.stable_id == 991 }) }
+      let(:forked_repetition_updated_champ) { champ_for_update(forked_dossier.champs.find { _1.stable_id == 994 }) }
 
       before do
         dossier.champs.each do |champ|
           champ.update(value: 'old value')
         end
+        dossier.reload
         procedure.draft_revision.add_type_de_champ({
           type_champ: TypeDeChamp.type_champs.fetch(:text),
           libelle: "Un nouveau champ text"
@@ -395,18 +399,19 @@ RSpec.describe DossierCloneConcern do
         procedure.draft_revision.remove_type_de_champ(removed_champ.stable_id)
         procedure.draft_revision.find_and_ensure_exclusive_use(updated_champ.stable_id).update(libelle: "Un nouveau libelle")
         procedure.publish_revision!
+        added_champ.update(value: 'new value for added champ')
+        added_repetition_champ.update(value: "new value in repetition champ")
+
+        forked_updated_champ.update(value: 'new value for updated champ')
+        forked_repetition_updated_champ.update(value: 'new value for updated champ in repetition')
+        updated_champ.update(type: 'Champs::TextareaChamp')
+        repetition_updated_champ.update(type: 'Champs::TextareaChamp')
+        dossier.reload
+        forked_dossier.reload
       end
 
-      subject {
-        added_champ.update(value: 'new value for added champ')
-        updated_champ.update(value: 'new value for updated champ')
-        added_repetition_champ.update(value: "new value in repetition champ")
-        dossier.reload
-        super()
-      }
-
-      it { expect { subject }.to change { dossier.filled_champs.size }.by(1) }
-      it { expect { subject }.to change { dossier.filled_champs.sort_by(&:created_at).map(&:to_s) }.from(['old value', 'old value', 'Non', 'old value', 'old value']).to(['new value for updated champ', 'Non', 'old value', 'old value', 'new value for added champ', 'new value in repetition champ']) }
+      it { expect { subject }.to change { dossier.filled_champs.size }.by(3) }
+      it { expect { subject }.to change { dossier.filled_champs.sort_by(&:created_at).map(&:to_s) }.from(['old value', 'Non', 'old value']).to(['new value for updated champ', 'Non', 'new value for updated champ in repetition', 'old value', 'new value for added champ', 'new value in repetition champ']) }
 
       it "dossier after merge should be on last published revision" do
         expect(dossier.revision_id).to eq(procedure.revisions.first.id)
diff --git a/spec/tasks/maintenance/t20241216remove_non_unique_champs_task_spec.rb b/spec/tasks/maintenance/t20241216remove_non_unique_champs_task_spec.rb
new file mode 100644
index 000000000..61b490c27
--- /dev/null
+++ b/spec/tasks/maintenance/t20241216remove_non_unique_champs_task_spec.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+module Maintenance
+  RSpec.describe T20241216removeNonUniqueChampsTask do
+    describe "#process" do
+      subject(:process) { described_class.process(dossier) }
+      let(:procedure) { create(:procedure, types_de_champ_public: [{}]) }
+      let(:dossier) { create(:dossier, :with_populated_champs, procedure:) }
+      let(:type_de_champ) { dossier.revision.types_de_champ_public.first }
+      let(:champ_id) { dossier.champs.first.id }
+
+      before {
+        dossier.champs.create(**type_de_champ.params_for_champ)
+      }
+
+      it { expect { subject }.to change { dossier.reload.project_champ(type_de_champ).id }.from(dossier.champs.last.id).to(champ_id) }
+      it { expect { subject }.to change { Champ.count }.by(-1) }
+    end
+  end
+end