There isn't a way to trigger workflow operations in a different ticket from a single ticket (however, they can be prevented). As subtasks are (in JIRA) only considered a special Issue Type (with a special Issue Link to a given ticket), they are similarly immune to actions in other tickets.
The best way to fix this is to Reopen the parent ticket, then perform a JIRA issue search "parent = <parent_issue_id>" and Bulk Transition the resulting subtasks accordingly.
Does that help?
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