Airflow Dynamic Task Mapping showing "No Data found" for Mapped Task

Question

I have airflow version 2.6.0 and python version 3.9.2. I am following the official tutorial of Dynamic Task Mapping and I am using the example code for a dag:

from __future__ import annotations

from datetime import datetime

from airflow import DAG
from airflow.decorators import task

with DAG(dag_id="example_dynamic_task_mapping", start_date=datetime(2022, 3, 4)) as dag:

    @task
    def add_one(x: int):
        return x + 1

    @task
    def sum_it(values):
        total = sum(values)
        print(f"Total was {total}")

    added_values = add_one.expand(x=[1, 2, 3])
    sum_it(added_values)

Even though the dag runs sucessfully, the interface shows "No Data Found", as it can be seen in this print Why isn't it possible to see the output as it is shown in the tutorial?

I have tried updating the airflow to the current stable version (which is now 2.6.0) and tried to use the exact same code from the example, but it still does not work.