When server channel handles before completion call it tries to import transaction. If the transaction does not exists it creates a new one

https://github.com/wildfly/wildfly-transaction-client/blob/1.0.0.Beta24/src/main/java/org/wildfly/transaction/client/provider/remoting/TransactionServerChannel.java#L436

A discussed at JBEAP-11081 - I think the before completion should not be creating a new
transaction if does not exist. When somebody calling the remote server
to finish transaction it either knows it - then it should be finished or
it does not know it - then it should be responded as unknown txn.