LostSnowfluff opened a new pull request, #72486:
URL: https://github.com/apache/airflow/pull/72486

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   ## Description
   
   The Connections bulk update action accepts `update_mask` and documents that 
only
   the listed fields are applied. However, 
`BulkConnectionService.handle_bulk_update`
   does not pass `action.update_mask` to `update_orm_from_pydantic`.
   
   As a result, fields included in the request body but omitted from the update 
mask
   are still updated. For example, a request with `update_mask=["description"]` 
also
   changes `conn_type` when `conn_type` is present in the entity. This makes 
bulk
   updates inconsistent with the single-connection PATCH behavior and can modify
   fields that the caller did not intend to change.
   
   Pass `action.update_mask` to the existing ORM update helper so bulk updates 
apply
   the same field filtering as other update paths. Add a regression test 
covering a
   request that provides both `conn_type` and `description` while masking only
   `description`.
   
   No documentation changes are needed because this restores the behavior 
already
   described by the existing `update_mask` contract.
   
   
   
   ##### Was generative AI tooling used to co-author this PR?
   
   - [X] Yes (OpenAI Codex)
   
   Generated-by: OpenAI Codex following the guidelines at 
https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions
   


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