diff --git a/src/app/Packages/Domains/WorldHeritage/Adapter/AlgoliaWorldHeritageSearchAdapter.php b/src/app/Packages/Domains/WorldHeritage/Adapter/AlgoliaWorldHeritageSearchAdapter.php
index 97f72711..f4aab0ad 100644
--- a/src/app/Packages/Domains/WorldHeritage/Adapter/AlgoliaWorldHeritageSearchAdapter.php
+++ b/src/app/Packages/Domains/WorldHeritage/Adapter/AlgoliaWorldHeritageSearchAdapter.php
@@ -127,6 +127,12 @@ public function search(
                     'page' => $firstPage,
                     'hitsPerPage' => $perPage,
                     'filters' => $hasAnyFilter ? implode(' AND ', $filters) : null,
+                    /**
+                     * Only the id is ever read from the response (see below):
+                     * the full record is re-fetched from the DB via findByIdsPreserveOrder.
+                     * Restrict the payload accordingly.
+                     */
+                    'attributesToRetrieve' => ['objectID', 'id'],
                 ],
                 static fn ($v) => $v !== null,
             ),
@@ -156,12 +162,12 @@ public function search(
 
     /**
      * Build an OR-filter that can match different country input shapes:
-     * - English: country / state_party (exact match)
+     * - English: country (exact match)
      * - Japanese: country_name_jp (exact match)
      * - ISO3-like: state_party_codes:<ISO3>
      *
      * Example output:
-     * (country:"Japan" OR state_party:"Japan" OR country_name_jp:"日本" OR state_party_codes:JPN)
+     * (country:"Japan" OR country_name_jp:"日本" OR state_party_codes:JPN)
      */
     private function buildCountryOrFilter(string $raw): string
     {
@@ -170,7 +176,6 @@ private function buildCountryOrFilter(string $raw): string
 
         $orParts = [
             'country:"' . $quoted . '"',
-            'state_party:"' . $quoted . '"',
             'country_name_jp:"' . $quoted . '"',
         ];
 
diff --git a/src/app/Packages/Domains/WorldHeritage/Tests/AlgoliaWorldHeritageSearchAdapterTest.php b/src/app/Packages/Domains/WorldHeritage/Tests/AlgoliaWorldHeritageSearchAdapterTest.php
index cc1db094..9ce743be 100644
--- a/src/app/Packages/Domains/WorldHeritage/Tests/AlgoliaWorldHeritageSearchAdapterTest.php
+++ b/src/app/Packages/Domains/WorldHeritage/Tests/AlgoliaWorldHeritageSearchAdapterTest.php
@@ -52,6 +52,7 @@ public function test_search_builds_algolia_params_with_filters_and_paging(): voi
             'filters' =>
                 'state_party_codes:ECU AND study_region:"South America" AND category:"Natural" ' .
                 'AND year_inscribed >= 1978 AND year_inscribed <= 1980',
+            'attributesToRetrieve' => ['objectID', 'id'],
         ];
 
         $this->client
@@ -76,4 +77,48 @@ public function test_search_builds_algolia_params_with_filters_and_paging(): voi
         $this->assertSame(2, $result->currentPage);
         $this->assertSame(1, $result->lastPage);
     }
+
+    public function test_search_by_country_name_without_iso3_does_not_filter_on_state_party(): void
+    {
+        $indexName = 'world_heritage';
+        $adapter = new AlgoliaWorldHeritageSearchAdapter($this->client, $indexName);
+
+        $q = new AlgoliaSearchListQuery(
+            keyword: null,
+            countryName: 'Ecuador',
+            countryIso3: null,
+            region: null,
+            category: null,
+            yearFrom: null,
+            yearTo: null,
+            criteria: [],
+            isEndangered: null,
+            currentPage: 1,
+            perPage: 30,
+        );
+
+        $expectedParams = [
+            'query' => '',
+            'page' => 0,
+            'hitsPerPage' => 30,
+            'filters' => '(country:"Ecuador" OR country_name_jp:"Ecuador")',
+            'attributesToRetrieve' => ['objectID', 'id'],
+        ];
+
+        $this->client
+            ->shouldReceive('searchSingleIndex')
+            ->once()
+            ->with($indexName, $expectedParams)
+            ->andReturn([
+                'hits' => [],
+                'nbHits' => 0,
+                'nbPages' => 0,
+                'page' => 0,
+                'hitsPerPage' => 30,
+            ]);
+
+        $result = $adapter->search($q, currentPage: 1, perPage: 30);
+
+        $this->assertSame([], $result->ids);
+    }
 }