diff --git a/packages/core/test/TestCaseResult.types.ts b/packages/core/test/TestCaseResult.types.ts
index 60420819..d7d6daf3 100644
--- a/packages/core/test/TestCaseResult.types.ts
+++ b/packages/core/test/TestCaseResult.types.ts
@@ -13,6 +13,8 @@ export interface TestCase {
     value: FlagValue
     reason: string
     errorCode?: string
+    serialId?: number | null
+    doLog?: boolean
     variant?: string
     flagMetadata?: PrecomputedFlagMetadata
   }
diff --git a/packages/core/test/evaluation/flags-v1.spec.ts b/packages/core/test/evaluation/flags-v1.spec.ts
index 67875377..b5bcd6ca 100644
--- a/packages/core/test/evaluation/flags-v1.spec.ts
+++ b/packages/core/test/evaluation/flags-v1.spec.ts
@@ -26,6 +26,17 @@ describe('Universal Flag Configuration V1', () => {
     const ufcJson = fs.readFileSync(path.join(fixtureDirectory, 'ufc-config.json'), 'utf8')
     return JSON.parse(ufcJson) as UniversalFlagConfigurationV1
   }
+  // Keep ordered repeated cases on the same prepared configuration.
+  const configuration = getUFC()
+
+  const expectMetadata = (details: ResolutionDetails<FlagValue>, expected: TestCase['result']) => {
+    if (expected.serialId !== undefined) {
+      expect(details.flagMetadata?.__dd_split_serial_id ?? null).toBe(expected.serialId)
+    }
+    if (expected.doLog !== undefined) {
+      expect(details.flagMetadata?.__dd_do_log).toBe(expected.doLog)
+    }
+  }
 
   const getTestCaseFileNames = (): string[] => {
     const fixtureFiles = fs.readdirSync(path.join(fixtureDirectory, 'evaluation-cases')).sort()
@@ -45,7 +56,6 @@ describe('Universal Flag Configuration V1', () => {
     context: EvaluationContext,
     immediate: ExperimentationOptOutOption = false
   ): ResolutionDetails<FlagValue> => {
-    const configuration = getUFC()
     if (testCase.variationType === 'BOOLEAN') {
       return evaluateRulesBasedConfiguration(
         configuration,
@@ -94,7 +104,7 @@ describe('Universal Flag Configuration V1', () => {
   }
 
   it.each(['constructor', '__proto__'])('treats inherited JSON flag key %s as missing', (flagKey) => {
-    expect(evaluateRulesBasedConfiguration(getUFC(), 'boolean', flagKey, false, {}, logger)).toMatchObject({
+    expect(evaluateRulesBasedConfiguration(configuration, 'boolean', flagKey, false, {}, logger)).toMatchObject({
       value: false,
       reason: 'ERROR',
       errorCode: 'FLAG_NOT_FOUND',
@@ -119,6 +129,7 @@ describe('Universal Flag Configuration V1', () => {
       if (testCase.result.errorCode !== undefined || testCase.result.reason !== 'ERROR') {
         expect(details.errorCode).toEqual(testCase.result.errorCode)
       }
+      expectMetadata(details, testCase.result)
     })
 
     for (const [capability, mode] of [
@@ -134,6 +145,7 @@ describe('Universal Flag Configuration V1', () => {
           expect(details.value).toStrictEqual(expected.value)
           expect(details.reason).toEqual(expected.reason)
           expect(details.errorCode).toEqual(expected.errorCode)
+          expectMetadata(details, expected)
         })
       }
     }
diff --git a/packages/core/test/ffe-system-test-data b/packages/core/test/ffe-system-test-data
index 1c831fed..b2887620 160000
--- a/packages/core/test/ffe-system-test-data
+++ b/packages/core/test/ffe-system-test-data
@@ -1 +1 @@
-Subproject commit 1c831fed02a428a1b0a4ac412da9b773e22df257
+Subproject commit b28876200152f00c7d5eb04616f721afa5955c1d
diff --git a/packages/node-server/test/ffe-system.spec.ts b/packages/node-server/test/ffe-system.spec.ts
index 81d3657a..054b7c62 100644
--- a/packages/node-server/test/ffe-system.spec.ts
+++ b/packages/node-server/test/ffe-system.spec.ts
@@ -15,6 +15,8 @@ type SystemTestCase = {
   result: {
     value: FlagValue
     reason: string
+    serialId?: number | null
+    doLog?: boolean
   }
 }
 
@@ -52,10 +54,10 @@ function getTestCases(testCaseFileName: string): SystemTestCase[] {
   ) as SystemTestCase[]
 }
 
-async function evaluateTestCase(testCase: SystemTestCase): Promise<ResolutionDetails<FlagValue>> {
-  const provider = new DatadogNodeServerProvider({ exposureChannel })
-  provider.setConfiguration(configuration)
-
+async function evaluateTestCase(
+  provider: DatadogNodeServerProvider,
+  testCase: SystemTestCase
+): Promise<ResolutionDetails<FlagValue>> {
   const context = {
     ...(testCase.targetingKey === null ? {} : { targetingKey: testCase.targetingKey }),
     ...testCase.attributes,
@@ -77,12 +79,25 @@ async function evaluateTestCase(testCase: SystemTestCase): Promise<ResolutionDet
 describe('FFE system tests through DatadogNodeServerProvider', () => {
   describe.each(getTestCaseFileNames())('should evaluate for %s', (testCaseFileName) => {
     const testCases = getTestCases(testCaseFileName)
+    let provider: DatadogNodeServerProvider
+
+    beforeAll(() => {
+      // Repeated cases must exercise the same provider in fixture order.
+      provider = new DatadogNodeServerProvider({ exposureChannel })
+      provider.setConfiguration(configuration)
+    })
 
     it.each(testCases)('with context $targetingKey and flag $flag', async (testCase) => {
-      const details = await evaluateTestCase(testCase)
+      const details = await evaluateTestCase(provider, testCase)
 
       expect(details.value).toEqual(testCase.result.value)
       expect(details.reason).toEqual(testCase.result.reason)
+      if (testCase.result.serialId !== undefined) {
+        expect(details.flagMetadata?.__dd_split_serial_id ?? null).toBe(testCase.result.serialId)
+      }
+      if (testCase.result.doLog !== undefined) {
+        expect(details.flagMetadata?.__dd_do_log).toBe(testCase.result.doLog)
+      }
     })
   })
 })