Fix a potential duplicated completion invoking when task cancel #2319
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There seems to be a short period that the callback can be accessed from another thread before the next lock
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Fix a crash reported here: #2297 (comment)
There appears to be a brief window during which the callback can be accessed from another thread before the next lock is applied. This violates the assumption that the completion handler is invoked only once, leading to issues, particularly when task cancellation is involved.