Fix PG

tests/validation/config.json

@@ -633,7 +633,7 @@
         },
         {
             "title": "GLTF Alpha Blend",
-            "playgroundId": "#SYQW69#577",
+            "playgroundId": "#SYQW69#578",
             "referenceImage": "glTFAlphaBlend.png",
             "renderCount": 1
         },