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When a prepared statement completes, the code was calling queue.advance() to process pending queries, but the data written to the buffer was not being flushed. This caused a hang because: 1. The auto-flusher was registered in onData's defer block 2. But event_loop.exit() ran BEFORE registerAutoFlusher() 3. So the deferred task queue was drained before the auto-flusher was registered 4. The new data written by queue.advance() would never be flushed The fix replaces queue.advance() with flushQueue() in several places: - checkIfPreparedStatementIsDone() - main fix for the hang - handleAuth() OK case - for consistency - handleAuth() success auth case - for consistency - handlePreparedStatement() ERROR case - for consistency flushQueue() calls flushData() after queue.advance() to ensure any data written by newly executed queries is actually sent to the server. This is a follow-up to #26030, which fixed the same pattern for pool size = 1. The issue persisted for pool size > 1 because the auto-flusher timing is different when multiple connections are involved. Fixes #26235 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>