ai-agents-fallback-data-corrup-multimodal-request-with-image-url-fails-on-primary-cd191797

THEN Deep copy the messages list before passing it to each provider to prevent cross-provider mutation. For example, use `copy.deepcopy(messages)` when constructing the request payload, ensuring each provider receives an independent copy.

import copy
# Before calling provider, deep copy messages
provider_messages = copy.deepcopy(messages)
response = await provider.avoid_mutation(provider_messages)