private boolean isHashKnown(final Bytes forkHash) {
    return allForkIds.stream().map(ForkId::getHash).anyMatch(hash -> hash.equals(forkHash));
  }
Non EIP-2124 behaviour

@param peerGenesisHash Hash to be validated.
@return boolean
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/forkid/ForkIdManager.java