banking_stage::handle_forwarding is retaining buffered packets with empty index, so nothing is held: https://github.com/solana-labs/solana/blob/6f3926b64/core/src/banking_stage.rs#L520
banking_stage::handle_forwarding is retaining buffered packets with empty index, so nothing is held: https://github.com/solana-labs/solana/blob/6f3926b64/core/src/banking_stage.rs#L520