diff --git a/app/components/dossiers/edit_footer_component.rb b/app/components/dossiers/edit_footer_component.rb
index b5acc51f2..f68ec2ef7 100644
--- a/app/components/dossiers/edit_footer_component.rb
+++ b/app/components/dossiers/edit_footer_component.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class Dossiers::EditFooterComponent < ApplicationComponent
-  delegate :can_passer_en_construction?, to: :@dossier
+  delegate :can_passer_en_construction?, :can_transition_to_en_construction?, :forked_with_changes?, to: :@dossier
 
   def initialize(dossier:, annotation:)
     @dossier = dossier
@@ -18,7 +18,43 @@ class Dossiers::EditFooterComponent < ApplicationComponent
     @annotation.present?
   end
 
-  def disabled_submit_buttons_options
+  def can_submit?
+    can_submit_draft? || can_submit_en_construction?
+  end
+
+  def can_submit_draft?
+    !annotation? && can_transition_to_en_construction?
+  end
+
+  def can_submit_en_construction?
+    forked_with_changes?
+  end
+
+  def submit_button_label
+    if can_submit_draft?
+      t('.submit')
+    else
+      t('.submit_changes')
+    end
+  end
+
+  def submit_button_path
+    if can_submit_draft?
+      brouillon_dossier_path(@dossier)
+    else
+      modifier_dossier_path(@dossier.editing_fork_origin)
+    end
+  end
+
+  def submit_button_options
+    if can_submit_draft?
+      submit_draft_button_options
+    else
+      submit_en_construction_button_options
+    end
+  end
+
+  def disabled_submit_button_options
     {
       class: 'fr-text--sm fr-mb-0 fr-mr-2w',
       data: { 'fr-opened': "true" },
diff --git a/app/components/dossiers/edit_footer_component/edit_footer_component.html.haml b/app/components/dossiers/edit_footer_component/edit_footer_component.html.haml
index 2f0f59b2b..f6a727a3e 100644
--- a/app/components/dossiers/edit_footer_component/edit_footer_component.html.haml
+++ b/app/components/dossiers/edit_footer_component/edit_footer_component.html.haml
@@ -2,16 +2,10 @@
   .send-dossier-actions-bar
     = render Dossiers::AutosaveFooterComponent.new(dossier: @dossier, annotation: annotation?)
 
-    - if !annotation? && @dossier.can_transition_to_en_construction?
+    - if can_submit?
       - if !can_passer_en_construction?
-        = link_to t('.submit_disabled'), "#", disabled_submit_buttons_options
-      = button_to t('.submit'), brouillon_dossier_url(@dossier), submit_draft_button_options
-
-    - if @dossier.forked_with_changes?
-      - if !can_passer_en_construction?
-        = link_to t('.submit_disabled'), "#", disabled_submit_buttons_options
-      = button_to t('.submit_changes'), modifier_dossier_url(@dossier.editing_fork_origin), submit_en_construction_button_options
-
+        = link_to t('.submit_disabled'), "#", disabled_submit_button_options
+      = button_to submit_button_label, submit_button_path, submit_button_options
 
   - if @dossier.brouillon? && !owner?
     .fr-pb-2w.invite-cannot-submit
@@ -19,7 +13,5 @@
         - c.with_body do
           %p.fr-pb-0= t('.invite_notice').html_safe
 
-
-
   - if !annotation?
     = render partial: "shared/dossiers/submit_is_over", locals: { dossier: @dossier }
diff --git a/app/controllers/users/dossiers_controller.rb b/app/controllers/users/dossiers_controller.rb
index f82a05e73..2e82070d9 100644
--- a/app/controllers/users/dossiers_controller.rb
+++ b/app/controllers/users/dossiers_controller.rb
@@ -235,10 +235,7 @@ module Users
         @dossier.passer_en_construction!
         redirect_to merci_dossier_path(@dossier)
       else
-        respond_to do |format|
-          format.html { render :brouillon }
-          format.turbo_stream
-        end
+        render :brouillon
       end
     end
 
@@ -256,6 +253,7 @@ module Users
 
     def modifier
       @dossier = dossier_with_champs
+      @dossier_for_editing = dossier.owner_editing_fork
     end
 
     def submit_en_construction
@@ -268,29 +266,21 @@ module Users
 
       submit_dossier_and_compute_errors
 
-      if @dossier.errors.blank? && @dossier.can_passer_en_construction?
-        editing_fork_origin.merge_fork(@dossier)
+      if dossier.errors.blank? && dossier.can_passer_en_construction?
+        editing_fork_origin.merge_fork(dossier)
         editing_fork_origin.submit_en_construction!
-
         redirect_to dossier_path(editing_fork_origin)
       else
-        respond_to do |format|
-          format.html do
-            render :modifier
-          end
-
-          format.turbo_stream do
-            @to_show, @to_hide, @to_update = champs_to_turbo_update(champs_public_attributes_params, dossier.champs.filter(&:public?))
-            render :update, layout: false
-          end
-        end
+        @dossier_for_editing = dossier
+        @dossier = editing_fork_origin
+        render :modifier
       end
     end
 
     def update
       @dossier = dossier.en_construction? ? dossier.find_editing_fork(dossier.user) : dossier
       @dossier = dossier_with_champs(pj_template: false)
-      @can_passer_en_construction_was, @can_passer_en_construction_is = @dossier.track_can_passer_en_construction do
+      @can_passer_en_construction_was, @can_passer_en_construction_is = dossier.track_can_passer_en_construction do
         update_dossier_and_compute_errors
       end
 
@@ -308,8 +298,8 @@ module Users
 
     def champ
       @dossier = dossier_with_champs(pj_template: false)
-      type_de_champ = @dossier.find_type_de_champ_by_stable_id(params[:stable_id], :public)
-      champ = @dossier.project_champ(type_de_champ, params[:row_id])
+      type_de_champ = dossier.find_type_de_champ_by_stable_id(params[:stable_id], :public)
+      champ = dossier.project_champ(type_de_champ, params[:row_id])
 
       respond_to do |format|
         format.turbo_stream do
@@ -543,36 +533,34 @@ module Users
     end
 
     def update_dossier_and_compute_errors
-      @dossier.update_champs_attributes(champs_public_attributes_params, :public, updated_by: current_user.email)
-      updated_champs = @dossier.champs.filter(&:changed_for_autosave?)
-      if updated_champs.present?
-        @dossier.last_champ_updated_at = Time.zone.now
-      end
+      dossier.update_champs_attributes(champs_public_attributes_params, :public, updated_by: current_user.email)
+      updated_champs = dossier.champs.filter(&:changed_for_autosave?)
 
       # We save the dossier without validating fields, and if it is successful and the client
       # requests it, we ask for field validation errors.
-      if @dossier.save
-        if updated_champs.any?(&:used_by_routing_rules?)
-          @update_contact_information = true
-          RoutingEngine.compute(@dossier)
+      if dossier.save
+        if dossier.brouillon? && updated_champs.present?
+          dossier.touch(:last_champ_updated_at)
+          if updated_champs.any?(&:used_by_routing_rules?)
+            @update_contact_information = true
+            RoutingEngine.compute(dossier)
+          end
         end
 
         if params[:validate].present?
-          @dossier.valid?(:champs_public_value)
+          dossier.valid?(:champs_public_value)
         end
       end
-
-      @dossier.errors
     end
 
     def submit_dossier_and_compute_errors
-      @dossier.validate(:champs_public_value)
-      @dossier.check_mandatory_and_visible_champs
+      dossier.validate(:champs_public_value)
+      dossier.check_mandatory_and_visible_champs
 
-      if @dossier.editing_fork_origin&.pending_correction?
-        @dossier.editing_fork_origin.validate(:champs_public_value)
-        @dossier.editing_fork_origin.errors.where(:pending_correction).each do |error|
-          @dossier.errors.import(error)
+      if dossier.editing_fork_origin&.pending_correction?
+        dossier.editing_fork_origin.validate(:champs_public_value)
+        dossier.editing_fork_origin.errors.where(:pending_correction).each do |error|
+          dossier.errors.import(error)
         end
       end
     end
diff --git a/app/models/concerns/dossier_clone_concern.rb b/app/models/concerns/dossier_clone_concern.rb
index 193561fe4..6f5aab6f2 100644
--- a/app/models/concerns/dossier_clone_concern.rb
+++ b/app/models/concerns/dossier_clone_concern.rb
@@ -26,12 +26,6 @@ module DossierCloneConcern
     find_or_create_editing_fork(user).tap { DossierPreloader.load_one(_1) }
   end
 
-  def reset_editing_fork!
-    if editing_fork? && forked_with_changes?
-      destroy_editing_fork!
-    end
-  end
-
   def destroy_editing_fork!
     if editing_fork?
       update!(hidden_by_administration_at: Time.current, hidden_by_reason: :stale_fork)
@@ -43,6 +37,18 @@ module DossierCloneConcern
     editing_fork_origin_id.present?
   end
 
+  def forked_with_changes?
+    if forked_diff.present?
+      forked_diff.values.any?(&:present?) || forked_groupe_instructeur_changed?
+    end
+  end
+
+  def champ_forked_with_changes?(champ)
+    if forked_diff.present?
+      forked_diff.values.any? { |champs| champs.any? { _1.public_id == champ.public_id } }
+    end
+  end
+
   def make_diff(editing_fork)
     origin_champs_index = project_champs_public_all.index_by(&:public_id)
     forked_champs_index = editing_fork.project_champs_public_all.index_by(&:public_id)
@@ -126,18 +132,6 @@ module DossierCloneConcern
     cloned_dossier.reload
   end
 
-  def forked_with_changes?
-    if forked_diff.present?
-      forked_diff.values.any?(&:present?) || forked_groupe_instructeur_changed?
-    end
-  end
-
-  def champ_forked_with_changes?(champ)
-    if forked_diff.present?
-      forked_diff.values.any? { _1.include?(champ) }
-    end
-  end
-
   private
 
   def forked_diff
diff --git a/spec/controllers/users/dossiers_controller_spec.rb b/spec/controllers/users/dossiers_controller_spec.rb
index 68fe7a830..2b855d3a6 100644
--- a/spec/controllers/users/dossiers_controller_spec.rb
+++ b/spec/controllers/users/dossiers_controller_spec.rb
@@ -836,10 +836,11 @@ describe Users::DossiersController, type: :controller do
     before { sign_in(user) }
 
     let(:procedure) { create(:procedure, :published, types_de_champ_public: [{}, { type: :piece_justificative }]) }
-    let!(:dossier) { create(:dossier, :en_construction, user:, procedure:) }
-    let(:first_champ) { dossier.project_champs_public.first }
+    let(:dossier) { create(:dossier, :en_construction, user:, procedure:) }
+    let!(:editing_fork) { dossier.owner_editing_fork }
+    let(:first_champ) { editing_fork.project_champs_public.first }
+    let(:piece_justificative_champ) { editing_fork.project_champs_public.last }
     let(:anchor_to_first_champ) { controller.helpers.link_to I18n.t('views.users.dossiers.fix_champ'), brouillon_dossier_path(anchor: first_champ.labelledby_id), class: 'error-anchor' }
-    let(:piece_justificative_champ) { dossier.project_champs_public.last }
     let(:value) { 'beautiful value' }
     let(:file) { fixture_file_upload('spec/fixtures/files/piece_justificative_0.pdf', 'application/pdf') }
     let(:now) { Time.zone.parse('01/01/2100') }
@@ -887,14 +888,9 @@ describe Users::DossiersController, type: :controller do
 
       it 'updates the dossier timestamps' do
         subject
-        dossier.reload
-        expect(dossier.updated_at).to eq(now)
-        expect(dossier.last_champ_updated_at).to eq(now)
-      end
-
-      it 'updates the dossier state' do
-        subject
-        expect(dossier.reload.state).to eq(Dossier.states.fetch(:en_construction))
+        editing_fork.reload
+        expect(editing_fork.updated_at).to eq(now)
+        expect(editing_fork.last_champ_updated_at).to eq(now)
       end
 
       it { is_expected.to have_http_status(:ok) }
@@ -923,9 +919,9 @@ describe Users::DossiersController, type: :controller do
 
         it 'updates the dossier timestamps' do
           subject
-          dossier.reload
-          expect(dossier.updated_at).to eq(now)
-          expect(dossier.last_champ_updated_at).to eq(now)
+          editing_fork.reload
+          expect(editing_fork.updated_at).to eq(now)
+          expect(editing_fork.last_champ_updated_at).to eq(now)
         end
       end
     end
@@ -958,14 +954,10 @@ describe Users::DossiersController, type: :controller do
       end
 
       context 'iban error' do
+        let(:types_de_champ_public) { [{ type: :iban }] }
         let(:value) { 'abc' }
 
-        before do
-          first_champ.type_de_champ.update!(type_champ: :iban, mandatory: true, libelle: 'l')
-          dossier.project_champs_public.first.becomes!(Champs::IbanChamp).save!
-
-          subject
-        end
+        before { subject }
 
         it { expect(response).to have_http_status(:success) }
       end
@@ -998,9 +990,7 @@ describe Users::DossiersController, type: :controller do
     end
 
     context 'when the champ is a phone number' do
-      let(:procedure) { create(:procedure, :published, types_de_champ_public: [{ type: :phone }]) }
-      let!(:dossier) { create(:dossier, :en_construction, user:, procedure:) }
-      let(:first_champ) { dossier.project_champs_public.first }
+      let(:types_de_champ_public) { [{ type: :phone }] }
       let(:now) { Time.zone.parse('01/01/2100') }
 
       let(:submit_payload) do