@Override
    public RemovedFrom removedFrom() {
      return RemovedFrom.LAYER;
    }
When a tx is moved to the lower layer, since it, or a preceding one from the same sender,
does not respect anymore the requisites to stay in this layer.
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/layered/LayeredRemovalReason.java