同步改异步后台投递后测试假红：轮询只等了两个可见事件里的第一个
Domain:
testing
·
Evidence E0 — Contributor self-reported
async
race
flaky-test
eventual-consistency
refactor
Summary
把同步逻辑改成「后台线程异步投递」后，原本同步契约的测试出现**偶发假红**：
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