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help WorldSavedData for a Client side only mod

Hi, So I'm trying to use WordSavedData for a client side only mod to store a list of blocks. I've attempted to follow other mods, the mc source and the forge docs but I can't seem to understand why when I restart the world the data saved to the nbt is lost. Heres my WorldSavedData public class BlockStorage extends WorldSavedData { private static final String DATA_KEY = Reference.MOD_NAME + "_BlockData"; private HashMap<String, BlockData> blockStorage = new HashMap<>(); public BlockStorage() { super(DATA_KEY); } public BlockStorage(String name) { super(name); } public static BlockStorage get(World world) { MapStorage storage = world.getMapStorage(); if (storage == null) throw new IllegalStateException("World#getMapStorage returned null. The following WorldSave failed to save data: " + DATA_KEY); BlockStorage instance = (BlockStorage) storage.getOrLoadData(BlockStorage.class, DATA_KEY); if (instance == null) { instance = new BlockStorage(); storage.setData(DATA_KEY, instance); } return instance; } @Override @ParametersAreNonnullByDefault public void readFromNBT(NBTTagCompound nbt) { NBTTagList list = nbt.getTagList("blocks", 10); for (int i = 0; i < list.tagCount(); ++i) { NBTTagCompound compound = list.getCompoundTagAt(i); blockStorage.put( compound.getString("key"), new BlockData( compound.getString("entryName"), new OutlineColor( compound.getIntArray("color") ), new ItemStack( compound.getCompoundTag("stack") ), compound.getBoolean("drawing") ) ); } } @Override public NBTTagCompound writeToNBT(NBTTagCompound compound) { NBTTagList list = new NBTTagList(); blockStorage.forEach( (k, v) -> { NBTTagCompound c = new NBTTagCompound(); c.setString("key", k); c.setString("entryName", v.getEntryName()); c.setIntArray("color", new int[]{v.getOutline().getRed(), v.getOutline().getGreen(), v.getOutline().getBlue()}); c.setBoolean("drawing", v.isDrawing()); c.setTag("stack", v.getItemStack().writeToNBT(new NBTTagCompound())); list.appendTag(c); }); compound.setTag("blocks", list); return compound; } public HashMap<String, BlockData> getBlockStorage() { return blockStorage; } public void setBlockStorage(HashMap<String, BlockData> blockStorage) { this.blockStorage = blockStorage; } } Heres how I access & save to it BlockStorage storage = BlockStorage.get(XRay.mc.player.world); // No blocks exist if( storage == null ) return; storage.getBlockStorage().forEach( (k, v) -> { System.out.println(k); System.out.println(v.toString()); }); // Adding to it BlockStorage storage = BlockStorage.get(mc.player.world); if (storage != null) { storage.setBlockStorage( Controller.getBlockStore().getStore() ); storage.markDirty(); } Any help is appreacheted but if this is something that isn't possible in a single player only mod then any advice on what I should be using instead would be greatly appreachted too 👍

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