Fix root transform matrix format, allow using all four root transform formats (#9496)

src/main/java/net/minecraftforge/client/model/ExtendedBlockModelDeserializer.java

@@ -63,7 +63,7 @@ public class ExtendedBlockModelDeserializer extends BlockModel.Deserializer
 
         if (jsonobject.has("transform"))
         {
-            JsonObject transform = GsonHelper.getAsJsonObject(jsonobject, "transform");
+            JsonElement transform = jsonobject.get("transform");
             model.customData.setRootTransform(deserializationContext.deserialize(transform, Transformation.class));
         }
 

src/main/java/net/minecraftforge/common/util/TransformationHelper.java

@@ -250,7 +250,7 @@ public final class TransformationHelper
             if (!e.isJsonArray()) throw new JsonParseException("Matrix: expected an array, got: " + e);
             JsonArray m = e.getAsJsonArray();
             if (m.size() != 3) throw new JsonParseException("Matrix: expected an array of length 3, got: " + m.size());
-            Matrix4f matrix = new Matrix4f().zero();
+            Matrix4f matrix = new Matrix4f();
             for (int rowIdx = 0; rowIdx < 3; rowIdx++)
             {
                 if (!m.get(rowIdx).isJsonArray()) throw new JsonParseException("Matrix row: expected an array, got: " + m.get(rowIdx));
@@ -268,6 +268,8 @@ public final class TransformationHelper
                     }
                 }
             }
+            // JOML's unsafe matrix component setter does not recalculate these properties, so the matrix would stay marked as identity
+            matrix.determineProperties();
             return matrix;
         }