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When a cursor closes before its first backend response arrives, late responses can reset its state and send a second Close/Sync pair. The extra ReadyForQuery can advance the client's query queue too early and corrupt the next query's result. Preserve closed and failed states when handling late descriptions, and keep closed cursors closed when delivering rows. Fields and the active read callback still get delivered. Add focused late-message tests and a PostgreSQL regression that closes before responses arrive, checks for a single Sync, and reuses the connection. Settlement of reads left in the cursor's queue remains outside this fix.
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When a cursor closes before its first backend response arrives, late responses can reset its state and send a second Close/Sync pair. The extra ReadyForQuery can advance the client's query queue too early and corrupt the next query's result.
Preserve closed and failed states when handling late descriptions, and keep closed cursors closed when delivering rows. Fields and the active read callback still get delivered.
Add focused late-message tests and a PostgreSQL regression that closes before responses arrive, checks for a single Sync, and reuses the connection.