Implement BlockEntity sectionX/Z methods

api/src/main/java/com/viaversion/viaversion/api/minecraft/blockentity/BlockEntity.java

@@ -27,12 +27,12 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public interface BlockEntity {
 
-    default byte relX() {
-        return -1; //TODO
+    default byte sectionX() {
+        return (byte) ((packedXZ() >> 4) & 15);
     }
 
-    default byte relZ() {
-        return -1; //TODO
+    default byte sectionZ() {
+        return (byte) (packedXZ() & 15);
     }
 
     byte packedXZ();

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_18to1_17_1/BlockEntityIds.java

@@ -50,4 +50,8 @@ public final class BlockEntityIds {
         }
         return newId;
     }
+
+    public static int[] getIds() {
+        return IDS;
+    }
 }

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_18to1_17_1/packets/WorldPackets.java

@@ -144,7 +144,6 @@ public final class WorldPackets {
                         }
 
                         // Fill biome palette
-                        //TODO Use single value palette if given the possibility
                         final DataPaletteImpl biomePalette = new DataPaletteImpl();
                         section.addPalette(PaletteType.BIOMES, biomePalette);
                         for (int biomeIndex = i * BIOMES_PER_CHUNK; biomeIndex < (i * BIOMES_PER_CHUNK) + BIOMES_PER_CHUNK; biomeIndex++) {