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Please run down the following list and make sure you've tried the usual "quick fixes":

• Search the issues already opened: https://github.com/googleapis/python-api-core/issues
• Search StackOverflow: https://stackoverflow.com/questions/tagged/google-cloud-platform+python

If you are still having issues, please be sure to include as much information as possible:

Environment details

• OS type and version:
• Python version: python --version
• pip version: pip --version
• google-api-core version: pip show google-api-core
  google-api-core = "2.25.0" and google-api-core = "2.25.1"

When accessing Gemini with 200 code, the format of payload is Dict, but when getting 429 code, the format of payload changes to Array.
This causes the original processing logic changing.

Steps to reproduce

1. 

2. ?

Code example

# example

Stack trace

# example

Making sure to follow these steps will guarantee the quickest resolution possible.

Thanks!