import asyncio
import os

async def main():
    asyncio.current_task().set_name("main")
    task = asyncio.create_task(asyncio.sleep(3600), name="worker")
    future = asyncio.get_running_loop().create_future()
    asyncio.future_add_to_awaited_by(task, future)
    task.add_done_callback(future.set_result)
    print(os.getpid(), flush=True)
    try:
        await future
    finally:
        asyncio.future_discard_from_awaited_by(task, future)


asyncio.run(main())

sudo ./python.exe -m asyncio pstree <PID>

└── (T) main
    └──  main /Users/timofeiivankov/cpython/repro.py:12

└── (T) main
    └──  main /Users/timofeiivankov/cpython/repro.py:12
        └── (F) Future-0x104e82a80
            └── (T) worker
                └──  sleep /Users/timofeiivankov/cpython/Lib/asyncio/tasks.py:733

import asyncio

async def worker():
    asyncio.print_call_graph(limit=0)
    
async def main():
    asyncio.current_task().set_name("main")
    task = asyncio.create_task(worker(), name="worker")
    future = asyncio.get_running_loop().create_future()
    asyncio.future_add_to_awaited_by(task, future)
    task.add_done_callback(future.set_result)
    try:
        await future
    finally:
        asyncio.future_discard_from_awaited_by(task, future)

asyncio.run(main())

* Task(name='worker', id=0x1014d47d0)
  + Awaited by:
    * Future(id=0x10115ea80)
      + Awaited by:
        * Task(name='main', id=0x1014d45f0)