Changes made in Advanced Roadmaps plan are not reflected in Jira although success message is seen
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
Changes made to Jira issue fields from Advanced Roadmaps plan are not reflected on the Jira issue, although you can see the message "change was successfully saved to Jira" after using the "Review Changes" functionality:

Environment
Jira Server/Data Center 8.20.0 and any higher version
Diagnosis
While saving the changes, following message is logged in the application log (atlassian-jira.log). Notice, the line that says feature disabled in feature manager
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2024-05-31T06:40:19.914Z | https-jsse-nio-8443-exec-11 url: /rest/jpo/1.0/issues/commit; user: XXX | DEBUG | [XXX] | [520x322067x1] | [2mdj5] | [XXX,XXX] | [/rest/jpo/1.0/issues/commit] | [c.a.r.j.c.scenario.issue.DefaultScenarioIssueAssigneeAction] | set issue assignee for issue: 799281
2024-05-31T06:40:19.914Z | https-jsse-nio-8443-exec-11 url: /rest/jpo/1.0/issues/commit; user: XXX | DEBUG | [XXX] | [520x322067x1] | [2mdj5] | [XXX,XXX] | [/rest/jpo/1.0/issues/commit] | [c.a.r.j.c.scenario.issue.DefaultScenarioIssueAssigneeAction] | try to get assigneeId for given resources Optional.absent()
2024-05-31T06:40:19.914Z | https-jsse-nio-8443-exec-11 url: /rest/jpo/1.0/issues/commit; user: XXX | DEBUG | [XXX] | [520x322067x1] | [2mdj5] | [XXX,XXX] | [/rest/jpo/1.0/issues/commit] | [c.a.r.c.env.features.JiraFeatureTester] | test feature: SIMPLE_PLANS
2024-05-31T06:40:19.914Z | https-jsse-nio-8443-exec-11 url: /rest/jpo/1.0/issues/commit; user: XXX | DEBUG | [XXX] | [520x322067x1] | [2mdj5] | [XXX,XXX] | [/rest/jpo/1.0/issues/commit] | [c.a.r.c.env.features.JiraFeatureTester] | try to read feature from feature manager
2024-05-31T06:40:19.914Z | https-jsse-nio-8443-exec-11 url: /rest/jpo/1.0/issues/commit; user: XXX | DEBUG | [XXX] | [520x322067x1] | [2mdj5] | [XXX,XXX] | [/rest/jpo/1.0/issues/commit] | [c.a.r.c.env.features.JiraFeatureTester] | feature disabled in feature manager
Check the dark features for the site by accessing <BASE_URL> /SiteDarkFeatures!Default.jspa as Jira Admin and verify if com.atlassian.portfolio.simpleplans.disabled is set as shown below.

Cause
com.atlassian.portfolio.simpleplans.disabled Dark Feature is preventing the changes to be saved to Jira.
Solution
Disable the Dark Feature com.atlassian.portfolio.simpleplans.disabled (by following the instructions in the dark features documentation) and retry saving the changes: the changes should now be reflected in the Jira issue view.
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