I guess there must be a workflow property which restricts editing in the closed status.
You can remove the property and you will be able to edit the issue. But it all depends on your requirements:
1. You could remove the property.
2. You could let only a certain group to edit the issue. You would need to set the workflow property like this:
You can read more about worflow properties here:
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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