diff --git a/frontend/cypress/e2e/side_window/mission_form/sea_control_edition.spec.ts b/frontend/cypress/e2e/side_window/mission_form/sea_control_edition.spec.ts
index 89cd151747..535a60c32f 100644
--- a/frontend/cypress/e2e/side_window/mission_form/sea_control_edition.spec.ts
+++ b/frontend/cypress/e2e/side_window/mission_form/sea_control_edition.spec.ts
@@ -369,4 +369,52 @@ context('Side Window > Mission Form > Sea Control Edition', () => {
     cy.wait(250)
     cy.get('.Toastify__toast--success').should('not.exist')
   })
+
+  /**
+   * Non-regression test to prevent the modal to be showed when an action is created.
+   * The `isDirty` field was not reset after a POST request.
+   */
+  it('Should not show an unsaved modal confirmation When an action is created', () => {
+    // Given
+    editSideWindowMissionListMissionWithId(34, SeaFrontGroup.MEMN)
+    cy.intercept('POST', '/api/v1/missions/34', {
+      body: {
+        id: 1
+      },
+      statusCode: 201
+    })
+    cy.intercept('DELETE', '/bff/v1/mission_actions/*', {
+      body: {
+        id: 2
+      },
+      statusCode: 200
+    })
+    cy.intercept('POST', '/bff/v1/mission_actions', {
+      body: {
+        id: 1
+      },
+      statusCode: 201
+    }).as('updateAction')
+    cy.clickButton('Supprimer l’action')
+    cy.wait(500)
+
+    // When
+    cy.clickButton('Ajouter')
+    cy.clickButton('Ajouter un contrôle à la débarque')
+
+    // eslint-disable-next-line @typescript-eslint/no-unused-expressions
+    cy.get('input[placeholder="Rechercher un navire..."]').type('pheno').wait(250)
+    cy.contains('mark', 'PHENO').click()
+    cy.get('#port').parent().click({ force: true })
+    cy.get('.rs-search-box-input').type('saintmalo{enter}', { force: true })
+    // Should select the right port
+    cy.get('.Field-Select').contains('Saint-Malo (FRSML)')
+    cy.fill('Saisi par', 'Marlin')
+    cy.wait('@updateAction')
+    cy.wait(500)
+
+    // Then
+    cy.clickButton('Fermer')
+    cy.get('.Component-Dialog').should('not.exist')
+  })
 })
diff --git a/frontend/src/features/Mission/useCases/autoSaveMissionAction.ts b/frontend/src/features/Mission/useCases/autoSaveMissionAction.ts
index 0e0dccb2b5..5483d49afa 100644
--- a/frontend/src/features/Mission/useCases/autoSaveMissionAction.ts
+++ b/frontend/src/features/Mission/useCases/autoSaveMissionAction.ts
@@ -35,6 +35,8 @@ export const autoSaveMissionAction =
           missionActionApi.endpoints.createMissionAction.initiate(missionActionData)
         ).unwrap()
 
+        dispatch(missionFormActions.setIsDraftDirty(false))
+
         return id
       }
 
diff --git a/frontend/src/features/Mission/useCases/saveMission.ts b/frontend/src/features/Mission/useCases/saveMission.ts
index 79a3992666..f16e738fb3 100644
--- a/frontend/src/features/Mission/useCases/saveMission.ts
+++ b/frontend/src/features/Mission/useCases/saveMission.ts
@@ -24,6 +24,8 @@ export const saveMission =
           monitorenvMissionApi.endpoints.createMission.initiate(newMission)
         ).unwrap()
 
+        initIsDraftDirtyAndListenToEvents()
+
         return {
           ...nextMainFormValues,
           createdAtUtc: createdMission.createdAtUtc,
@@ -35,10 +37,7 @@ export const saveMission =
       const nextMission = getUpdatedMissionFromMissionMainFormValues(missionId, nextMainFormValues)
       const updatedMission = await dispatch(monitorenvMissionApi.endpoints.updateMission.initiate(nextMission)).unwrap()
 
-      dispatch(missionFormActions.setIsDraftDirty(false))
-      setTimeout(() => {
-        dispatch(missionFormActions.setIsListeningToEvents(true))
-      }, 500)
+      initIsDraftDirtyAndListenToEvents()
 
       return {
         ...nextMainFormValues,
@@ -54,4 +53,11 @@ export const saveMission =
 
       return nextMainFormValues
     }
+
+    function initIsDraftDirtyAndListenToEvents() {
+      dispatch(missionFormActions.setIsDraftDirty(false))
+      setTimeout(() => {
+        dispatch(missionFormActions.setIsListeningToEvents(true))
+      }, 500)
+    }
   }