diff --git a/levels/test_internal_nodes.gd b/levels/test_internal_nodes.gd
index d82085b..91ba292 100644
--- a/levels/test_internal_nodes.gd
+++ b/levels/test_internal_nodes.gd
@@ -39,5 +39,10 @@ func _add_internal_cube_mesh() -> void:
 	mat.albedo_color = Color("ff4c4e")
 	b.material = mat
 	
+	# Lock the node in editor. Prevents selection (here for internal nodes)
+	# UNDOCUMENTED
+	# https://github.com/godotengine/godot-proposals/issues/3046
+	m.set_meta("_edit_lock_", true)
+	
 	m.owner = self
 	m.position.x = 1.5 * get_child_count(true)
diff --git a/levels/test_internal_nodes.tscn b/levels/test_internal_nodes.tscn
index 3a40a6f..0fa485d 100644
--- a/levels/test_internal_nodes.tscn
+++ b/levels/test_internal_nodes.tscn
@@ -25,14 +25,16 @@ script = ExtResource("1_glqbe")
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 1.5, 0, 0)
 mesh = SubResource("BoxMesh_glqbe")
 
-[node name="MeshInstance3D3" type="MeshInstance3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 4.5, 0, 0)
+[node name="MeshInstance3D4" type="MeshInstance3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 6, 0, 0)
 mesh = SubResource("BoxMesh_dodl2")
 
 [node name="MeshInstance3D2" type="MeshInstance3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 3, 0, 0)
 mesh = SubResource("BoxMesh_j0q2q")
+metadata/_edit_lock_ = true
 
-[node name="MeshInstance3D4" type="MeshInstance3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 6, 0, 0)
+[node name="MeshInstance3D3" type="MeshInstance3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 4.5, 0, 0)
 mesh = SubResource("BoxMesh_bkhqo")
+metadata/_edit_lock_ = true