The issue was discovered after upgrading JIRA from version 8.1 to 9.12.
Check the console with F12 for the following error.
After upgrading JIRA from version 8.1 to 9.12, the “Fix Versions/s” field may display incorrectly due to UI changes or plugin incompatibility. Check the browser console (F12) for JavaScript errors—often caused by outdated add-ons or custom scripts. Ensure all plugins are updated to support JIRA 9.12. Also, clear browser cache and verify if the issue persists in incognito mode. If the problem continues, disable custom fields or UI modifications temporarily to isolate the cause. Atlassian support or community forums can also help if it's a version-specific bug. Upgrading all related apps often resolves such UI issues.
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