private boolean validateRoundZeroProposalHasNoRoundChangeCertificate(final Proposal proposal) {
    if (proposal.getRoundChangeCertificate().isPresent()) {
      LOG.info(
          "Illegal Proposal message, round-0 proposal must not contain a round change certificate.");
      return false;
    }
    return true;
  }
Validate proposal.

@param msg the msg
@return the boolean
consensus/ibft/src/main/java/org/hyperledger/besu/consensus/ibft/validation/MessageValidator.java