Ergo protocol reference client 4.0.45. It fixes spam attack vector against p2p network: a peer can announce valid block section id with improper type, and then the node will try to re-download it from the peer and then random neighbours, penalizing them all on the way, and traffic spike happens as well.
Since this version, the node forget about block section with improper type asked, and also do not serve other peers asking for such block sections (helping peers of older version to avoid unnecessary traffic).