Advanced Road Map configuration page gets blank after upgrading to Jira 9.1.0
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
After upgrading to Jira 9.1.0, Advanced Road Map configuration page ( Plans > Configure ) does not render, only appearing a blank page.

Environment
Data Center / Server 9.1.0
Diagnosis
HAR File does not show any results
Safe-Mode does not fix it
Deleting the plugin's caches and pluginstate table's row does not fix it
Restarting does not fix it
Cause
Custom Announcement Banner could cause the Advanced Road Map configuration page ( Plans > Configure ) to not render, only appearing a blank page.
Solution
Remove the custom AnnouncementBanner HTML code. Go to System > Under User Interface > Select Announcement Banner > Remove all the content and save it.
In case the issue is fixed after removing the AnnouncementBanner HTML code, it seems that, since Jira's core code in version 9.1 has changed, the Announcement Banner's custom code, will also need to be adapted to work on this new version.
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