diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.ts
index 9763eda1c5b15..30e6d3d53e664 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.ts
@@ -19,6 +19,9 @@ import type { AliasAction, FetchIndexResponse } from '../actions';
 import type { BulkIndexOperationTuple } from './create_batches';
 import { OutdatedDocumentsSearchRead, ReindexSourceToTempRead } from '../state';
 
+/** @internal */
+export const REINDEX_TEMP_SUFFIX = '_reindex_temp';
+
 /** @internal */
 export type Aliases = Partial<Record<string, string>>;
 
@@ -309,7 +312,7 @@ export function getMigrationType({
  * @returns A temporary index name to reindex documents
  */
 export const getTempIndexName = (indexPrefix: string, kibanaVersion: string): string =>
-  `${indexPrefix}_${kibanaVersion}_reindex_temp`;
+  `${indexPrefix}_${kibanaVersion}${REINDEX_TEMP_SUFFIX}`;
 
 /** Increase batchSize by 20% until a maximum of maxBatchSize */
 export const increaseBatchSize = (
diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.ts
index 38eccfd3bb087..e4f38c2a32a3c 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.ts
@@ -46,6 +46,7 @@ import {
   increaseBatchSize,
   hasLaterVersionAlias,
   aliasVersion,
+  REINDEX_TEMP_SUFFIX,
 } from './helpers';
 import { buildTempIndexMap, createBatches } from './create_batches';
 import type { MigrationLog } from '../types';
@@ -1541,7 +1542,7 @@ export const model = (currentState: State, resW: ResponseType<AllActionStates>):
         // migration from the same source.
         return { ...stateP, controlState: 'MARK_VERSION_INDEX_READY_CONFLICT' };
       } else if (isTypeof(left, 'index_not_found_exception')) {
-        if (left.index === stateP.tempIndex) {
+        if (left.index.endsWith(REINDEX_TEMP_SUFFIX)) {
           // another instance has already completed the migration and deleted
           // the temporary index
           return { ...stateP, controlState: 'MARK_VERSION_INDEX_READY_CONFLICT' };
diff --git a/src/core/server/integration_tests/saved_objects/migrations/group3/dot_kibana_split.test.ts b/src/core/server/integration_tests/saved_objects/migrations/group3/dot_kibana_split.test.ts
index 72fc1aad81e3e..a7377ec2050d1 100644
--- a/src/core/server/integration_tests/saved_objects/migrations/group3/dot_kibana_split.test.ts
+++ b/src/core/server/integration_tests/saved_objects/migrations/group3/dot_kibana_split.test.ts
@@ -12,6 +12,7 @@ import {
   type ISavedObjectTypeRegistry,
   type SavedObjectsType,
   MAIN_SAVED_OBJECT_INDEX,
+  ALL_SAVED_OBJECT_INDICES,
 } from '@kbn/core-saved-objects-server';
 import { DEFAULT_INDEX_TYPES_MAP } from '@kbn/core-saved-objects-base-server-internal';
 import {
@@ -406,6 +407,7 @@ describe('split .kibana index into multiple system indices', () => {
   });
 
   // FLAKY: https://github.com/elastic/kibana/issues/157510
+  // This test takes too long. Can be manually executed to verify the correct behavior.
   describe.skip('when multiple Kibana migrators run in parallel', () => {
     it('correctly migrates 7.7.2_xpack_100k_obj.zip archive', async () => {
       esServer = await startElasticsearch({
@@ -414,15 +416,29 @@ describe('split .kibana index into multiple system indices', () => {
       const esClient = await getEsClient();
 
       const breakdownBefore = await getAggregatedTypesCountAllIndices(esClient);
-      expect(breakdownBefore).toMatchSnapshot('before migration');
+      expect(breakdownBefore).toEqual({
+        '.kibana': {
+          'apm-telemetry': 1,
+          config: 1,
+          dashboard: 52994,
+          'index-pattern': 1,
+          search: 1,
+          space: 1,
+          'ui-metric': 5,
+          visualization: 53004,
+        },
+        '.kibana_task_manager': {
+          task: 5,
+        },
+      });
 
       for (let i = 0; i < PARALLEL_MIGRATORS; ++i) {
         await clearLog(Path.join(__dirname, `dot_kibana_split_instance_${i}.log`));
       }
 
       const testKits = await Promise.all(
-        new Array(PARALLEL_MIGRATORS)
-          .fill({
+        new Array(PARALLEL_MIGRATORS).fill(true).map((_, index) =>
+          getKibanaMigratorTestKit({
             settings: {
               migrations: {
                 discardUnknownObjects: currentVersion,
@@ -431,13 +447,10 @@ describe('split .kibana index into multiple system indices', () => {
             },
             kibanaIndex: MAIN_SAVED_OBJECT_INDEX,
             types: typeRegistry.getAllTypes(),
+            defaultIndexTypesMap: DEFAULT_INDEX_TYPES_MAP,
+            logFilePath: Path.join(__dirname, `dot_kibana_split_instance_${index}.log`),
           })
-          .map((config, index) =>
-            getKibanaMigratorTestKit({
-              ...config,
-              logFilePath: Path.join(__dirname, `dot_kibana_split_instance_${index}.log`),
-            })
-          )
+        )
       );
 
       const results = await Promise.all(testKits.map((testKit) => testKit.runMigrations()));
@@ -447,9 +460,30 @@ describe('split .kibana index into multiple system indices', () => {
           .every((result) => result.status === 'migrated' || result.status === 'patched')
       ).toEqual(true);
 
+      await esClient.indices.refresh({ index: ALL_SAVED_OBJECT_INDICES });
+
       const breakdownAfter = await getAggregatedTypesCountAllIndices(esClient);
-      expect(breakdownAfter).toMatchSnapshot('after migration');
-    });
+      expect(breakdownAfter).toEqual({
+        '.kibana': {
+          'apm-telemetry': 1,
+          config: 1,
+          space: 1,
+          'ui-metric': 5,
+        },
+        '.kibana_alerting_cases': {},
+        '.kibana_analytics': {
+          dashboard: 52994,
+          'index-pattern': 1,
+          search: 1,
+          visualization: 53004,
+        },
+        '.kibana_ingest': {},
+        '.kibana_security_solution': {},
+        '.kibana_task_manager': {
+          task: 5,
+        },
+      });
+    }, 1200000);
 
     afterEach(async () => {
       await esServer?.stop();