RLPx 5 has two CTR streams based on the same key, IV, and nonce. This can facilitate decryption on a private network.
https://github.com/hyperledger/besu/issues/7926
https://github.com/ethereum/go-ethereum/issues/1315
https://github.com/ethereum/devp2p/issues/32
https://github.com/ethereum/devp2p/blob/master/rlpx.md#known-issues-in-the-current-version
https://github.com/LaurentMT/go-ethereum/commit/e8cba7283b57280b1bcf5761478f852398365901