[bug]: completed_at shows wrong time = assignation of the task to a user

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

While using endpoint issues:
/api/v1/workspaces/worksp/projects/de6669994209c/issues/

In the list I can see that the completed_at time is wrong because it's showing the moment I edited the assigned user

As following

{
"id": "a6933c5e-6c99-489a-9874-0bfdddcaf782",
"type_id": null,
"created_at": "2025-08-08T14:19:12.299939+02:00",
"updated_at": "2025-08-08T17:07:06.992474+02:00",
"deleted_at": null,
"point": null,
"name": "AAAAAA",
"description_html": "AAAAA",
"description_binary": null,
"priority": "high",
"start_date": null,
"target_date": null,
"sequence_id": 110,
"sort_order": 486605.0,

**"completed_at": "2025-08-08T17:07:06.956310+02:00",**


"archived_at": null,
"is_draft": false,
"external_source": null,
"external_id": null,
"created_by": "7bcdb774-9879-4daf-b608-f4293f38aa27",
"updated_by": "7bcdb774-9879-4daf-b608-f4293f38aa27",
"project": "de1971f8-81c3-430b-a2a4-7e5f7ef6359c",
"workspace": "3cc51c16-8e5a-4fcc-a5f7-c65c71a014ec",
"parent": null,
"state": {
  "id": "2bda50ab-8523-495d-a434-9c4bb2c32774",
  "name": "Done",
  "color": "#16A34A",
  "group": "completed"
},
"estimate_point": null,
"type": null,
"assignees": [
  {
    "id": "7bcdb774-9879-4daf-b608-f4293f38aa27",
    "first_name": "ME",
    "last_name": "ME",
    "email": "ME@ME.com",
    "avatar": "",
    "avatar_url": "/api/assets/v2/static/1d2cOOO4851906b/",        
    "display_name": "GG"
  }
],
"labels": []

},

EDITED THE USERS ASSIGNED TO THE TASK...

{
"id": "a6933c5e-6c99-489a-9874-0bfdddcaf782",
"type_id": null,
"created_at": "2025-08-08T14:19:12.299939+02:00",
"updated_at": "2025-08-08T17:15:44.794599+02:00",
"deleted_at": null,
"point": null,
"name": "AAAAA",
"description_html": "AAAAA",
"description_binary": null,
"priority": "high",
"start_date": null,
"target_date": null,
"sequence_id": 110,
"sort_order": 486605.0,

**"completed_at": "2025-08-08T17:15:44.761456+02:00",**


"archived_at": null,
"is_draft": false,
"external_source": null,
"external_id": null,
"created_by": "7bcdb774-9879-4daf-b608-f4293f38aa27",
"updated_by": "7bcdb774-9879-4daf-b608-f4293f38aa27",
"project": "de1971f8-81c3-430b-a2a4-7e5f7ef6359c",
"workspace": "3cc51c16-8e5a-4fcc-a5f7-c65c71a014ec",
"parent": null,
"state": {
  "id": "2bda50ab-8523-495d-a434-9c4bb2c32774",
  "name": "Done",
  "color": "#16A34A",
  "group": "completed"
},
"estimate_point": null,
"type": null,
"assignees": [
  {
    "id": "7bcdb774-9879-4daf-b608-f4293f38aa27",
    "first_name": "ME",
    "last_name": "ME",
    "email": "ME@ME.com",
    "avatar": "",
    "avatar_url": "/api/assets/v2/static/1d2c5OOO1906b/",        
    "display_name": "GG"
  }
],
"labels": []

},

Steps to reproduce

Mark a task as completed, then assign an user to it and each user you assign the completed_at will show the time you added the user not the time you completed the task

Environment

Production

Browser

None

Variant

Cloud

Version

community