can't break nether roof, fixes #164

src/main/java/baritone/cache/CachedChunk.java

@@ -128,6 +128,9 @@ public final class CachedChunk implements IBlockTypeAccess {
             return state;
         }
         PathingBlockType type = getType(x, y, z);
+        if (type == PathingBlockType.SOLID && y == 128 && mc.player.dimension == -1) {
+            return Blocks.BEDROCK.getDefaultState();
+        }
         return ChunkPacker.pathingTypeToBlock(type);
     }