Traceback (most recent call last):
  File "/home/runner/work/distributed/distributed/distributed/worker.py", line 3975, in validate_task
    self.validate_task_fetch(ts)
  File "/home/runner/work/distributed/distributed/distributed/worker.py", line 3917, in validate_task_fetch
    assert ts.who_has
AssertionError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/share/miniconda3/envs/dask-distributed/lib/python3.10/site-packages/tornado/ioloop.py", line 741, in _run_callback
    ret = callback()
  File "/usr/share/miniconda3/envs/dask-distributed/lib/python3.10/site-packages/tornado/ioloop.py", line 765, in _discard_future_result
    future.result()
  File "/home/runner/work/distributed/distributed/distributed/worker.py", line 1191, in handle_scheduler
    await self.handle_stream(comm, every_cycle=[self.ensure_communicating])
  File "/home/runner/work/distributed/distributed/distributed/core.py", line 625, in handle_stream
    handler(**merge(extra, msg))
  File "/home/runner/work/distributed/distributed/distributed/worker.py", line 1916, in handle_compute_task
    self.transitions(recommendations, stimulus_id=stimulus_id)
  File "/home/runner/work/distributed/distributed/distributed/worker.py", line 2621, in transitions
    self.validate_task(ts)
  File "/home/runner/work/distributed/distributed/distributed/worker.py", line 3985, in validate_task
    raise AssertionError(
AssertionError: Invalid TaskState encountered for <TaskState "('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)" fetch>.
Story:
[("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'compute-task', 'compute-task-1650128700.1081934', 1650128700.1481702), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'released', 'waiting', 'waiting', {"('rechunk-split-77b7d884d5a5f48f375d62bb7d136665', 1333)": 'fetch'}, 'compute-task-1650128700.1081934', 1650128700.1482384), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'waiting', 'ready', 'ready', {}, 'ensure-communicating-1650128700.1599193', 1650128700.2175784), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'ready', 'executing', 'executing', {}, 'compute-task-1650128696.340246', 1650128700.218642), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'put-in-memory', 'compute-task-1650128696.340246', 1650128700.268273), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'executing', 'memory', 'memory', {"('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 251)": 'executing'}, 'compute-task-1650128696.340246', 1650128700.268321), ('free-keys', ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)",), 'processing-released-1650128700.5942154', 1650128701.1206636), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'release-key', 'processing-released-1650128700.5942154', 1650128701.1[2067](https://github.com/dask/distributed/runs/6048720092?check_suite_focus=true#step:11:2067)46), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'memory', 'released', 'released', {"('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)": 'forgotten'}, 'processing-released-1650128700.5942154', 1650128701.1[2073](https://github.com/dask/distributed/runs/6048720092?check_suite_focus=true#step:11:2073)92), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'released', 'forgotten', 'forgotten', {}, 'processing-released-1650128700.5942154', 1650128701.1[2075](https://github.com/dask/distributed/runs/6048720092?check_suite_focus=true#step:11:2075)35), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'ensure-task-exists', 'released', 'compute-task-1650128701.1707418', 1650128701.1864583), ("('rechunk-merge-77b7d884d5a5f48f375d62bb7d136665', 0, 333)", 'released', 'fetch', 'fetch', {}, 'compute-task-1650128701.1707418', 1650128701.1865091)]