ProcessInstance is not correctly persisted when loaded with readOnly = true early in the same transaction

With conditions below:

• Parent/Sub process
• Tx1
  • Start a parent process instance
  • Sub process is started by CallActivity
  • Reached to a Human Task in the sub process. Tx Committed
• Tx2
  • Load the parent process with getProcessInstance(parentProcessInstanceId, true) // readOnly = true
  • Complete the Task in the sub process
  • Sub process is completed
  • Parent process instance is resumed
  • Reached to a Human Task in the parent process. Tx Committed

Parent ProcessInstance is not correctly persisted at the last step. For example, process variable is not updated.