TaskSet missing _cp_last_run attribute

[ionutab]

Prerequisites

• I am using the latest version of Locust
• I am reporting a bug, not asking a question

Description

When using the constant_pacing wait time strategy in a task set, an error is thrown.
TaskSet instances do not have a _cp_last_run attribute.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\P3701275\projects\20240104_TaskSetTest\venv\Lib\site-packages\locust\user\task.py", line 343, in run
    self.execute_next_task()
  File "C:\Users\P3701275\projects\20240104_TaskSetTest\venv\Lib\site-packages\locust\user\task.py", line 376, in execute_next_task
    self.execute_task(self._task_queue.pop(0))
  File "C:\Users\P3701275\projects\20240104_TaskSetTest\venv\Lib\site-packages\locust\user\task.py", line 494, in execute_task
    task(self.user).run()
  File "C:\Users\P3701275\projects\20240104_TaskSetTest\venv\Lib\site-packages\locust\user\task.py", line 371, in run
    self.wait()
  File "C:\Users\P3701275\projects\20240104_TaskSetTest\venv\Lib\site-packages\locust\user\task.py", line 449, in wait
    self._sleep(self.wait_time())
                ^^^^^^^^^^^^^^^^
  File "C:\Users\P3701275\projects\20240104_TaskSetTest\venv\Lib\site-packages\locust\user\wait_time.py", line 52, in wait_time_func
    run_time = time() - self._cp_last_run - self._cp_last_wait_time
                        ^^^^^^^^^^^^^^^^^
AttributeError: 'MyTaskSet' object has no attribute '_cp_last_run'

Command line

locust -f locustfile_cp_nested.py -t 20s -H "http://www.google.com" --headless

Locustfile contents

from locust import TaskSet, constant, task, HttpUser, constant_pacing


class MyUser(HttpUser):
    wait_time = constant(1)

    @task
    class MyTaskSet(TaskSet):
        wait_time = constant_pacing(1)

        @task
        def do_something(self):
            self.client.get("/")

Python version

3.11

Locust version

2.20.1

Operating system

Windows