diff --git a/tests/Scenarios/CaresTest.php b/tests/Scenarios/CaresTest.php
index c91a5b6..49410a9 100644
--- a/tests/Scenarios/CaresTest.php
+++ b/tests/Scenarios/CaresTest.php
@@ -296,6 +296,38 @@ public function testManyManyThrough(string $readingMode, string $saveMethod, boo
         $this->assertCacheKeyChanges($page, $model, $readingMode, $saveMethod, $expectKeyChange);
     }
 
+    public function testUnsavedRelationList(): void
+    {
+        // Updates are processed as part of scaffold, so we need to flush before we kick off
+        ProcessedUpdatesService::singleton()->flush();
+
+        // A page that is not (yet) saved in the DB
+        $page = CaresPage::create();
+
+        // A model that is saved in the DB
+        $model = $this->objFromFixture(CaredHasMany::class, 'model2');
+        // Specifically fetching this way to make sure it's us fetching without any generation of KeyHash
+        $originalKey = CacheKey::findInStage($page);
+
+        // Our $page is not yet saved, so there should be no cache key
+        $this->assertNull($originalKey);
+
+        // Flush updates so that new changes generate new CacheKey hashes
+        ProcessedUpdatesService::singleton()->flush();
+
+        // Add $model to a relationship on Page. At this stage CaredHasMany() is an UnsavedRelationList
+        $page->CaredHasMany()->add($model);
+
+        // The UnsavedRelationList should now be converted to a DataList
+        $page->write();
+
+        // Specifically fetching this way to make sure it's us fetching without any generation of KeyHash
+        $newKey = CacheKey::findInStage($page);
+
+        $this->assertNotNull($newKey);
+        $this->assertNotEmpty($newKey->KeyHash);
+    }
+
     protected function assertCacheKeyChanges(
         CaresPage $page,
         DataObject $model,
diff --git a/tests/Scenarios/CaresTest.yml b/tests/Scenarios/CaresTest.yml
index a6fe5ef..26e9dec 100644
--- a/tests/Scenarios/CaresTest.yml
+++ b/tests/Scenarios/CaresTest.yml
@@ -17,6 +17,8 @@ Terraformers\KeysForCache\Tests\Mocks\Models\CaredHasOneVersionedNonStaged:
 Terraformers\KeysForCache\Tests\Mocks\Models\CaredHasMany:
   model1:
     Title: Has Many Model 1
+  model2:
+    Title: Has Many Model 2
 
 Terraformers\KeysForCache\Tests\Mocks\Models\CaredManyMany:
   model1: