"Updated at" timestamp not updated during atomic update

[m0rt3nlund]

Describe the bug
The "Updated at" timestamp seems to not get updated during atomic update

To Reproduce

defmodule Shared.Ash.Support.CRM.Agent do
  use Ash.Resource,
    data_layer: AshPostgres.DataLayer

  attributes do
    uuid_primary_key :id do
      generated? true
      default nil
    end

    attribute :status, :string do
      default "idle"
    end

    update_timestamp :updated_at
    create_timestamp :inserted_at
  end
end

Shared.Ash.Support.CRM.Agent
|> Shared.Ash.Support.read_one!()
|> Ash.Changeset.for_update(:update, %{status: status})
|> Shared.Ash.Support.update()

Expected behavior
Expect the updated_at timestamp to update

Runtime

• Elixir version: 1.16
• Erlang version: OTP 26
• OS: Windows
• Ash version: 2.20.2
• any related extension versions

[zachdaniel]

Fixed in latest main (and back ported to 2.0)