private boolean isForkKnown(final Long nextFork) {
    return highestKnownFork < nextFork
        || allForkIds.stream().map(ForkId::getNext).anyMatch(fork -> fork.equals(nextFork));
  }
Non EIP-2124 behaviour

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