Fix transition UI bug in datamap report

[lucanovera]

Ticket ENG-2061

Description Of Changes

Fixes an issue where if you go to the datamap report and open the details for different systems, sometimes you will see the details of the previously selected system for 1-2s before it updates.

Code Changes

• Use currentData instead of data for RTK hook to avoid using stale data

Steps to Confirm

1. Open datamap report
   
2. Click on a system name and the drawer should open
3. Close the drawer
4. Click on a different system while paying attention to the drawer opening again
5. Check that while the drawer opens a loading state is showing and it's not showing the details of the previously selected system

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
  • Add a db-migration This indicates that a change includes a database migration label to the entry if your change includes a DB migration
  • Add a high-risk This issue suggests changes that have a high-probability of breaking existing code label to the entry if your change includes a high-risk change (i.e. potential for performance impact or unexpected regression) that should be flagged
  • Updates unreleased work already in Changelog, no new entry necessary
• UX feedback:
  • All UX related changes have been reviewed by a designer
  • No UX review needed
• Followup issues:
  • Followup issues created
  • No followup issues
• Database migrations:
  • Ensure that your downrev is up to date with the latest revision on main
  • Ensure that your downgrade() migration is correct and works
    • If a downgrade migration is not possible for this change, please call this out in the PR description!
  • No migrations
• Documentation:
  • Documentation complete, PR opened in fidesdocs
  • Documentation issue created in fidesdocs
  • If there are any new client scopes created as part of the pull request, remember to update public-facing documentation that references our scope registry
  • No documentation updates required

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Project	Deployment	Actions	Updated (UTC)
fides-plus-nightly	Ready	Preview, Comment	Feb 24, 2026 11:41pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
fides-privacy-center	Ignored		Feb 24, 2026 11:41pm

[greptile-apps]

Greptile Summary

This PR fixes a UI transition bug in the datamap report drawer where previously selected system details briefly appeared when opening a different system.

Key changes:

• Changed from data to currentData in the RTK Query hook useGetSystemByFidesKeyQuery to prevent cached stale data from displaying during system transitions
• Added proper changelog entry

RTK Query behavior:

• data returns the last successful query result and persists it even when parameters change, which causes stale data to show during transitions
• currentData only returns data for the current query parameters and becomes undefined when parameters change, allowing the loading state to display correctly

The fix is minimal, targeted, and correctly addresses the root cause of the issue.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change is a single-line fix that correctly addresses a well-defined UI bug by using the appropriate RTK Query return property. The fix follows RTK Query best practices and has no risk of breaking existing functionality.
• No files require special attention

Important Files Changed

Filename	Overview
changelog/7465-fix-datamap-drawer-stale-system.yaml	Properly formatted changelog entry describing the bug fix
clients/admin-ui/src/features/datamap/datamap-drawer/DatamapDrawer.tsx	Changed from data to currentData in RTK Query hook to prevent stale data from showing during transitions

_{Last reviewed commit: 2803828}

[greptile-apps]

_{2 files reviewed, no comments}

_{Edit Code Review Agent Settings | Greptile}

[gilluminate]

Approved with a minor suggestion