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## What's the problem Both `async_chat()` and `async_ask()` call `decorate_answer()` to build the final SSE payload — it inserts citation markers (`##N$$`) into the answer text and prunes `doc_aggs` to only the cited documents. Immediately after, both functions overwrite `final["answer"]` with `""`: ```python # async_chat(), line ~774 (issue #13828) final = decorate_answer(thought + full_answer) final["final"] = True final["audio_binary"] = None final["answer"] = "" # discards decorated text yield final # async_ask(), line ~1444 (same bug, different path) final = decorate_answer(full_answer) final["final"] = True final["answer"] = "" # discards decorated text yield final ``` The client receives filtered references (built for a citation-decorated answer it never sees) while displaying the raw, undecorated streaming text. Citations can never match. ## Root cause `final["answer"] = ""` was left over from an earlier design where clients were meant to reconstruct the full answer purely from delta events. Once `decorate_answer()` started placing citation markers, this blank-out broke the contract: the final event is where the decorated answer should land. ## Fix Remove the two blank-override lines — one in `async_chat()`, one in `async_ask()`: ```diff - final["answer"] = "" ``` `decorate_answer()` already sets `final["answer"]` to the correct decorated string; there is nothing to override. ## Relation to #13828 Issue #13828 and PR #13835 identify the bug in `async_chat()`. This PR absorbs that fix and also corrects the identical pattern in `async_ask()` (used by the `/retrieval` route in `chat_api.py`), which PR #13835 does not touch. ## Regression test Added `test/unit_test/api/db/services/test_dialog_service_final_answer.py` with three tests: | Test | Purpose | |------|---------| | `test_buggy_pattern_drops_answer` | Documents the old behaviour: blank-override empties the final answer | | `test_fixed_pattern_preserves_decorated_answer` | Core invariant: final event carries the decorated text from `decorate_answer()` | | `test_final_event_reference_matches_decorated_result` | Citation markers in the answer must match the pruned `doc_aggs` in the same event | Local run result: ``` test_dialog_service_final_answer.py::test_buggy_pattern_drops_answer PASSED test_dialog_service_final_answer.py::test_fixed_pattern_preserves_decorated_answer PASSED test_dialog_service_final_answer.py::test_final_event_reference_matches_decorated_result PASSED 3 passed in 0.04s ``` `ruff check` passes with no issues on all changed files. --------- Co-authored-by: edenfunf <edenfunf@gmail.com> Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>