Invalid TaskState released

[mrocklin]

https://github.com/dask/distributed/runs/6148662781?check_suite_focus=true

Traceback (most recent call last):
  File "/Users/runner/work/distributed/distributed/distributed/worker.py", line 3991, in validate_task
    self.validate_task_released(ts)
  File "/Users/runner/work/distributed/distributed/distributed/worker.py", line 3962, in validate_task_released
    assert not any(ts.key in has_what for has_what in self.has_what.values())
AssertionError

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

Traceback (most recent call last):
  File "/Users/runner/work/distributed/distributed/distributed/core.py", line 625, in handle_stream
    handler(**merge(extra, msg))
  File "/Users/runner/work/distributed/distributed/distributed/worker.py", line 1727, in handle_free_keys
    self.transitions(recommendations, stimulus_id=stimulus_id)
  File "/Users/runner/work/distributed/distributed/distributed/worker.py", line 2635, in transitions
    self.validate_task(ts)
  File "/Users/runner/work/distributed/distributed/distributed/worker.py", line 3999, in validate_task
    raise AssertionError(
AssertionError: Invalid TaskState encountered for <TaskState 'ndarray-c380d2dc1cdf941cb55bb0ea78c929d7' released>.
Story:
[('ndarray-c380d2dc1cdf941cb55bb0ea78c929d7', 'ensure-task-exists', 'released', 'compute-task-1650839033.713147', 1650839033.725312)]

This came out of test_stress_scatter_death

cc @fjetter @crusaderky @gjoseph92