Invalid packed transaction while pushing action

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https://github.com/EOSEssentials/eos-java-rpc-wrapper/blob/97d4839c8978e1465defa518af7235ddf9387ac1/src/main/java/client/domain/common/transaction/TransactionAction.java#L20
Runing example from README.md causes Invalid packed transaction on stage Push the transaction.
Reverting hex_data to data resolves problem.