I'd create a Scriptrunner postfunction on the initial transition of the sub-task (e.g. create-transition).
The script would do this:
If type==subtask then get status of parent issue and transition the issue (sub-task) to the same status. That should be possible, but I have not yet written a script that transitions an issue.
You'll have to be careful however. The sub-task needs to have all the same status as the parents, so best to make sure they use the same workflow.
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