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An agent with user-isolated memory stores each user's context under a user-id key. Under load, some memory reads return another user's data. Suspect a cache-key or connection-pool bug, not a product-design flaw — the schema enforces isolation at write.
A ChromaDB-backed agent memory persists "User's preferred programming language is Python" but the user has since said "I've switched to Rust". The agent still retrieves and acts on the Python fact because it has higher embedding similarity to Python-framed queries. Overwriting isn't happening because each statement becomes a new vector.
A CrewAI crew of 5 specialist agents (researcher, writer, editor, fact-checker, SEO) duplicates work: the researcher produces a draft, the writer re-researches, the fact-checker re-fetches sources already fetched. Shared memory is configured but seemingly ignored.