refactor: Prevent duplicate features list GETS

[kyle-ssg]

…een environments

Thanks for submitting a PR! Please check the boxes below:

• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Uses RTK cache for feature list to reduce latency, long term solution will be to migrate fully away from the flux store but in the meantime this is a win.

Left = After (1 request instead of multiple)

Also adds loading indication between environment where we treat switching environment + fetching = loading

How did you test this code?

• Filtering features in production
• E2E covers a lot

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Project	Deployment	Actions	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview, Comment	Mar 11, 2026 4:43pm
flagsmith-frontend-staging	Ready	Preview, Comment	Mar 11, 2026 4:43pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Mar 11, 2026 4:43pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6927	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6927	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6927	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6927	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-6927	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6927	Finished ✅	Results ✅

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 7 failed

Details

 7 tests across 4 suites
 24.3 seconds
 fbe48f9
 📦 Artifacts: View test results and HTML report
🔄 Run: #15245 (attempt 1)

Failed tests

firefox › tests/flag-tests.pw.ts › Flag Tests › Feature flags can be created, toggled, edited, and deleted across environments @oss
firefox › tests/flag-tests.pw.ts › Flag Tests › Feature flags can have tags added and be archived @oss
firefox › tests/initialise-tests.pw.ts › Signup › Create Organisation and Project @oss
firefox › tests/segment-test.pw.ts › Segment test 1 - Create, update, and manage segments with multivariate flags @oss
firefox › tests/segment-test.pw.ts › Segment test 2 - Test segment priority and overrides @oss
firefox › tests/segment-test.pw.ts › Segment test 3 - Test user-specific feature overrides @oss
firefox › tests/versioning-tests.pw.ts › Versioning tests - Create, edit, and compare feature versions @oss

### Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 12 failed

Details

 12 tests across 9 suites
 30.1 seconds
 fbe48f9
 📦 Artifacts: View test results and HTML report
🔄 Run: #15245 (attempt 1)

Failed tests

firefox › tests/change-request-test.pw.ts › Change Request Tests › Change requests can be created, approved, and published with 4-eyes approval @enterprise
firefox › tests/environment-permission-test.pw.ts › Environment Permission Tests › Environment-level permissions control access to features, identities, and segments @enterprise
firefox › tests/flag-tests.pw.ts › Flag Tests › Feature flags can be created, toggled, edited, and deleted across environments @oss
firefox › tests/flag-tests.pw.ts › Flag Tests › Feature flags can have tags added and be archived @oss
firefox › tests/initialise-tests.pw.ts › Signup › Create Organisation and Project @oss
firefox › tests/project-permission-test.pw.ts › Project Permission Tests › Project-level permissions control access to features, environments, audit logs, and segments @enterprise
firefox › tests/project-test.pw.ts › Project Tests › Additional Projects can be created and renamed with configurable change request approvals @enterprise
firefox › tests/roles-test.pw.ts › Roles Tests › Roles can be created with project and environment permissions @enterprise
firefox › tests/segment-test.pw.ts › Segment test 1 - Create, update, and manage segments with multivariate flags @oss
firefox › tests/segment-test.pw.ts › Segment test 2 - Test segment priority and overrides @oss
firefox › tests/segment-test.pw.ts › Segment test 3 - Test user-specific feature overrides @oss
firefox › tests/versioning-tests.pw.ts › Versioning tests - Create, edit, and compare feature versions @oss

### Playwright Test Results (oss - depot-ubuntu-latest-16)

 7 failed

Details

 7 tests across 4 suites
 24.2 seconds
 ca2e762
 📦 Artifacts: View test results and HTML report
🔄 Run: #15247 (attempt 1)

Failed tests

firefox › tests/flag-tests.pw.ts › Flag Tests › Feature flags can be created, toggled, edited, and deleted across environments @oss
firefox › tests/flag-tests.pw.ts › Flag Tests › Feature flags can have tags added and be archived @oss
firefox › tests/initialise-tests.pw.ts › Signup › Create Organisation and Project @oss
firefox › tests/segment-test.pw.ts › Segment test 1 - Create, update, and manage segments with multivariate flags @oss
firefox › tests/segment-test.pw.ts › Segment test 2 - Test segment priority and overrides @oss
firefox › tests/segment-test.pw.ts › Segment test 3 - Test user-specific feature overrides @oss
firefox › tests/versioning-tests.pw.ts › Versioning tests - Create, edit, and compare feature versions @oss

### Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 12 failed

Details

 12 tests across 9 suites
 30 seconds
 ca2e762
 📦 Artifacts: View test results and HTML report
🔄 Run: #15247 (attempt 1)

Failed tests

firefox › tests/change-request-test.pw.ts › Change Request Tests › Change requests can be created, approved, and published with 4-eyes approval @enterprise
firefox › tests/environment-permission-test.pw.ts › Environment Permission Tests › Environment-level permissions control access to features, identities, and segments @enterprise
firefox › tests/flag-tests.pw.ts › Flag Tests › Feature flags can be created, toggled, edited, and deleted across environments @oss
firefox › tests/flag-tests.pw.ts › Flag Tests › Feature flags can have tags added and be archived @oss
firefox › tests/initialise-tests.pw.ts › Signup › Create Organisation and Project @oss
firefox › tests/project-permission-test.pw.ts › Project Permission Tests › Project-level permissions control access to features, environments, audit logs, and segments @enterprise
firefox › tests/project-test.pw.ts › Project Tests › Additional Projects can be created and renamed with configurable change request approvals @enterprise
firefox › tests/roles-test.pw.ts › Roles Tests › Roles can be created with project and environment permissions @enterprise
firefox › tests/segment-test.pw.ts › Segment test 1 - Create, update, and manage segments with multivariate flags @oss
firefox › tests/segment-test.pw.ts › Segment test 2 - Test segment priority and overrides @oss
firefox › tests/segment-test.pw.ts › Segment test 3 - Test user-specific feature overrides @oss
firefox › tests/versioning-tests.pw.ts › Versioning tests - Create, edit, and compare feature versions @oss

### Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 2 failed

Details

 2 tests across 1 suite
 52.8 seconds
 6d2ffcb
 📦 Artifacts: View test results and HTML report
🔄 Run: #15248 (attempt 1)

Failed tests

firefox › tests/segment-test.pw.ts › Segment test 1 - Create, update, and manage segments with multivariate flags @oss
firefox › tests/segment-test.pw.ts › Segment test 2 - Test segment priority and overrides @oss

### Playwright Test Results (oss - depot-ubuntu-latest-16)

 2 failed

Details

 2 tests across 1 suite
 34.5 seconds
 6d2ffcb
 📦 Artifacts: View test results and HTML report
🔄 Run: #15248 (attempt 1)

Failed tests

firefox › tests/segment-test.pw.ts › Segment test 1 - Create, update, and manage segments with multivariate flags @oss
firefox › tests/segment-test.pw.ts › Segment test 2 - Test segment priority and overrides @oss

### Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 failed

Details

 2 tests across 1 suite
 49.7 seconds
 6d2ffcb
 📦 Artifacts: View test results and HTML report
🔄 Run: #15248 (attempt 1)

Failed tests

firefox › tests/segment-test.pw.ts › Segment test 1 - Create, update, and manage segments with multivariate flags @oss
firefox › tests/segment-test.pw.ts › Segment test 2 - Test segment priority and overrides @oss

### Playwright Test Results (oss - depot-ubuntu-latest-16)

 10 passed

Details

 10 tests across 7 suites
 43.6 seconds
 f2431ae
 🔄 Run: #15249 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 10 passed

Details

 10 tests across 7 suites
 28.9 seconds
 f2431ae
 🔄 Run: #15249 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 16 passed

Details

 16 tests across 13 suites
 1 minute, 8 seconds
 f2431ae
 🔄 Run: #15249 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 passed

Details

 2 tests across 2 suites
 1 minute, 3 seconds
 f2431ae
 🔄 Run: #15249 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 10 passed

Details

 10 tests across 7 suites
 29.7 seconds
 f2431ae
 🔄 Run: #15249 (attempt 2)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 10 passed

Details

 10 tests across 7 suites
 43.1 seconds
 f2431ae
 🔄 Run: #15249 (attempt 2)

[talissoncosta]

Hey @kyle-ssg , great work!!

I found a pre-existing bug while testing this PR (also reproduces on main):

Bug: Typing only whitespace (e.g. a space) in the search or value search filter sends search=%20 to the API, which returns a 400 "This field may not be blank.". On main, this also triggers a hard redirect to /404?entity=environment because the Flux store's catch block treats any error as a permission issue.

I've opened #6934 on top of your branch to fix it — it trims search values at the source in useFeatureFilters so whitespace-only input never triggers a state change or API request.