fix: block factory

generated_world/src/main/java/mc/world/generated_world/SeedBasedWorldGenerator.java

@@ -94,7 +94,7 @@ public class SeedBasedWorldGenerator implements WorldGenerator {
         private final Region region;
         private final int size = 256;
         private NoiseGenerator noiseGenerator;
-        private BlockFactory blockFactory;
+        private BlockFactory blockFactory = new BlockFactory();
 
         private double sigmoid (double x) {
             x -= 0.5;