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 the case proposed), 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. Concatenating them through f-string without 
task context merely stringifies these proxy objects together so that's why the 
weird outcome happened.

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

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