I have been getting the following error (repeatedly) in Airflow 2.9.0:

2024-05-07T11:10:43.522+0000] {local_executor.py:139} ERROR - Failed to execute task ' ti'.

Traceback (most recent call last):
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/executors/local_executor.py", line 135, in _execute_work_in_fork
    args.func(args)
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/cli/cli_config.py", line 49, in command
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/utils/cli.py", line 114, in wrapper
    return f(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/cli/commands/task_command.py", line 422, in task_run
    ti.init_run_context(raw=args.raw)
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/models/taskinstance.py", line 3307, in init_run_context
    self._set_context(self)
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/utils/log/logging_mixin.py", line 127, in _set_context
    set_context(self.log, context)
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/utils/log/logging_mixin.py", line 274, in set_context
    flag = cast(FileTaskHandler, handler).set_context(value)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/providers/microsoft/azure/log/wasb_task_handler.py", line 89, in set_context
    super().set_context(ti, identifier=identifier)
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/utils/log/file_task_handler.py", line 219, in set_context
    local_loc = self._init_file(ti, identifier=identifier)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/utils/log/file_task_handler.py", line 500, in _init_file
    local_relative_path = self._render_filename(ti, ti.try_number)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/airflow/.local/lib/python3.11/site-packages/airflow/utils/log/file_task_handler.py", line 290, in _render_filename
    return str_tpl.format(
           ^^^^^^^^^^^^^^^
KeyError: ' ti'

I used Airflow 2.2.0 before and there everything was still working fine without any errors or warnings. After the update to 2.9.0 and upgrading the database (using airflow db migrate --to-version="2.9.0"), I started receiving this error. This error also seemingly results in the scheduler crashing. The webserver is still accessible though.

Airflow is being run inside a docker container with the following base image: apache/airflow:2.9.0-python3.11

So far, I have already tried to set 'provide_context'=True in the default args and to specific PythonOperators.

Also note that the key where the key error occurs has a space in it (' ti'), which seems weird to me.

Does anyone know how to fix this error?