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fix(langchain-classic): fix Chain.save() regression from dict-to-model_dump migration #54852

fix(langchain-classic): fix Chain.save() regression from dict-to-model_dump migration

fix(langchain-classic): fix Chain.save() regression from dict-to-model_dump migration #54852

test-pydantic (libs/langchain, 2.9.0, 3.12)  /  Pydantic ~=2.9.0

succeeded Mar 25, 2026 in 29s