Reproduction steps:
start the complete the transaction subprocess regularly. get the activity instance at task "afterSuccess". "tx" is the id of the transaction.

Expected tree:

└── transactionProcess:1:3=>null
    └── afterSuccess=>null

Actual tree:

 └── transactionProcess:1:3=>4
    └── afterSuccess=>afterSuccess:65
        └── tx=>tx:56

failing test case incoming...