josh-fell commented on issue #29238:
URL: https://github.com/apache/airflow/issues/29238#issuecomment-1408937877

   @TJaniF Another variation, but what happens if you don't use `json.dumps()` 
on the `XComArg` being passed and without the `.partial()` on the operator? The 
manipulation of the `XComArg` _might_ be causing an oddity?
   
   ```py
   
       @task_group()
       def create_s3_files(num):
   
           @task
           def return_num_as_int(my_num):
               return my_num
   
           my_num_as_int = return_num_as_int(num)
   
           write_to_s3 = S3CreateObjectOperator(
               task_id="write_to_s3",
               aws_conn_id=AWS_CONN_ID,
               data="Hi",
               replace=True,
               s3_key=f"{MY_S3_BUCKET}/{my_num_as_int}.txt"
           )
   
           my_num_as_int >> write_to_s3
   
       tg_object = create_s3_files.expand(num=[0,1,2,3,4,5])
   ```


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