ai-agents-multimodal-fallback--multimodal-request-with-image-url-fails-on-primary-24632e8d

THEN Deep-copy the messages dictionary before applying provider-specific transformations in the router's fallback logic. This ensures each provider receives an unmutated copy and can apply its own format conversion. Alternatively, store the original request payload separately and regenerate the provider-specific payload for each attempt.

import copy
# Inside fallback handler:
original_messages = copy.deepcopy(request.messages)
# Transform for each provider without mutating shared object