Jira Cloud Migration Assistant early versions
In some earlier version of JCMA app by Atalssian, there were some compatibility issues.
Please make sure, that in the “Manage apps” admin page:
Your UPM is updated to the latest version.
Your “Jira Cloud Migration Assistant” app is updated to the latest version. (If you do not plan to migrate to the cloud, or in the process of migrating, you can also disable this app.)