public Bytes32 getTransientStorageValue(final Address accountAddress, final Bytes32 slot) {
    Bytes32 v = txValues.transientStorage().get(accountAddress, slot);
    return v == null ? Bytes32.ZERO : v;
  }
Gets the transient storage value, including values from parent frames if not set

@param accountAddress The address of the executing context
@param slot the slot to retrieve
@return the data value read
evm/src/main/java/org/hyperledger/besu/evm/frame/MessageFrame.java