GitHub user pykenny edited a comment on the discussion: Dynamic mapped tasks 
group arguments are interpreted as MappedArgument when provided to classic 
operators

Within the decorated task group context, parameter set `(project, dataset, 
table_name, partition_id)` seems to be some native Python variables (strings as 
for this example), but actually they are proxies that instruct tasks defined 
within the context what should be pulled from XCom (from which upstream task, 
and value corresponds to which key) and send to the (templated) parameters for 
running the task.

GitHub link: 
https://github.com/apache/airflow/discussions/40728#discussioncomment-12100820

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