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This pull request introduces a failing unit test to reproduce the bug reported in issue #32028. The test asserts the expected behavior: `BaseCallbackManager.merge()` should combine `handlers` and `inheritable_handlers` independently, without mixing them. This test will fail on the current codebase and is intended to guide the fix and prevent future regressions. --------- Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com> Co-authored-by: Mason Daugherty <mason@langchain.dev>