Yes, you can get the parent object of the issue and easily transition it to open state in the post-function (but only do it after checking that the current issue is a sub-task if sub-task and parent share the same workflow)
Here's the code in the answer, you need script runner installed.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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