Sorry to hear you are facing problems to create sub-tasks.
The only permission needed to create sub-tasks is the create issue permission independently of the JIRA application you are using, so I believe you might be facing a different problem.
Can you please let us know what are the changes you mentioned?
Additionally, are you using JIRA Server or Cloud? If you are using Cloud, are you using a classic or a next-gen project? The sub-task issues are not available yet on the next-gen projects.
In advance, I suggest you check if your sub-tasks are enabled on your instance by navigating to JIRA Setting > Issues > Sub-tasks
Let us know if this information helps.
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