[I] map_index_template does not change the map index displayed in the UI [airflow]

[via GitHub]

TJaniF opened a new issue, #49224:
URL: https://github.com/apache/airflow/issues/49224

   ### Apache Airflow version
   
   3.0.0
   
   ### If "Other Airflow 2 version" selected, which one?
   
   main branch
   
   ### What happened?
   
   In Airflow 2.10.5 the dag below changes the map index displayed in the UI:
   
   ```
   from airflow.decorators import dag, task
   
   @dag()
   def my_dag():
   
       @task
       def upstream_task():
           return [1, 2, 3]
   
       @task(
           map_index_template="Hello! {{ my_custom_template }}",
       )
       def map_me(x, **context):
           print(x)
   
           from airflow.operators.python import get_current_context
   
           context = get_current_context()
   
           context["my_custom_template"] = f"{x}"
   
       map_me.expand(x=upstream_task())
   
   my_dag()
   ```
   
   
   
![Image](https://github.com/user-attachments/assets/6529c866-8415-408e-9cd3-0669d10a41ce)
   
   
   In RC 2 `map_index_template` does not change the index. (no errors)
   
   ```
   from airflow.decorators import dag, task
   
   
   @dag
   def dtm():
   
       @task
       def upstream_task():
           return [1, 2, 3]
   
       @task(
           map_index_template="Hello! {{ my_custom_template }}",
       )
       def map_me(x):
           print(x)
   
           from airflow.sdk.definitions.context import get_current_context
   
           context = get_current_context()
   
           context["my_custom_template"] = f"{x}"
   
       map_me.expand(x=upstream_task())
   
   
   dtm()
   ```
   
   
![Image](https://github.com/user-attachments/assets/2a051c3f-7ef3-40bb-926a-eb9c66f6e97f)
   
   ### What you think should happen instead?
   
   _No response_
   
   ### How to reproduce
   
   Use the second dag above and run it. See the integer index in the UI.
   
   ### Operating System
   
   MacOS
   
   ### Versions of Apache Airflow Providers
   
   Breeze
   
   ### Deployment
   
   Other
   
   ### Deployment details
   
   breeze
   
   ### Anything else?
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [x] I agree to follow this project's [Code of 
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
   


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