private boolean isMsgFromKnownValidator(final Authored msg) {
    return bftFinalState.getValidators().contains(msg.getAuthor());
  }
Stop the current height manager by creating a no-op block height manager.

@param parentHeader the parent header
consensus/common/src/main/java/org/hyperledger/besu/consensus/common/bft/statemachine/BaseBftController.java