diff --git a/src/Entries/Entry.php b/src/Entries/Entry.php
index b1113005624..7ff4c5109b0 100644
--- a/src/Entries/Entry.php
+++ b/src/Entries/Entry.php
@@ -185,7 +185,7 @@ public function collection($collection = null)
 
     public function blueprint($blueprint = null)
     {
-        $key = "entry-{$this->id()}-blueprint";
+        $key = 'entry-'.($this->id() ?? 'obj-'.spl_object_id($this)).'-blueprint';
 
         return $this
             ->fluentlyGetOrSet('blueprint')
diff --git a/tests/Data/Entries/EntryTest.php b/tests/Data/Entries/EntryTest.php
index a87b106f23e..1b37cb24581 100644
--- a/tests/Data/Entries/EntryTest.php
+++ b/tests/Data/Entries/EntryTest.php
@@ -1358,6 +1358,25 @@ public function it_gets_the_default_collection_blueprint_when_undefined()
         $this->assertNotSame($first, $second);
     }
 
+    #[Test]
+    public function unsaved_entries_in_different_collections_do_not_share_a_blueprint()
+    {
+        BlueprintRepository::shouldReceive('in')->with('collections/blog')->andReturn(collect([
+            'post' => $post = (new Blueprint)->setHandle('post'),
+        ]));
+        BlueprintRepository::shouldReceive('in')->with('collections/products')->andReturn(collect([
+            'product' => $product = (new Blueprint)->setHandle('product'),
+        ]));
+        $blog = tap(Collection::make('blog'))->save();
+        $products = tap(Collection::make('products'))->save();
+
+        $blogEntry = (new Entry)->collection($blog);
+        $productEntry = (new Entry)->collection($products);
+
+        $this->assertSame($post, $blogEntry->blueprint());
+        $this->assertSame($product, $productEntry->blueprint());
+    }
+
     #[Test]
     public function the_blueprint_is_blinked_when_getting_and_flushed_when_setting()
     {
@@ -2154,6 +2173,7 @@ public function it_respects_custom_blueprint_template_path_per_collection()
         $blueprint = tap(Blueprint::make('standard_article')->setNamespace('collections.articles'))->save();
 
         $articleEntry = Entry::make('test')->collection($articles)->blueprint($blueprint->handle());
+        tap(Blueprint::make('standard_article')->setNamespace('collections.pages'))->save();
         $pageEntry = Entry::make('test')->collection($pages)->blueprint($blueprint->handle());
 
         // mapped collection uses the mapped prefix instead of the collection handle