Unlike BakedQuad, UnpackedBakedQuad does not propagate the diffuse lighting flag to Vertex Consumers. Made UnpackedBakedQuad conform to BakedQuad's behavior. (#3181)

src/main/java/net/minecraftforge/client/model/pipeline/UnpackedBakedQuad.java

@@ -74,6 +74,7 @@ public class UnpackedBakedQuad extends BakedQuad
         {
             // catch missing method errors caused by change to IVertexConsumer
         }
+        consumer.setApplyDiffuseLighting(applyDiffuseLighting);
         consumer.setQuadOrientation(getFace());
         for(int v = 0; v < 4; v++)
         {