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Make sure you use the latest version of Flywheel for 1.18.2, if you already use the latest version talk to the Mod author.

@Override public InteractionResult mobInteract(Player player, InteractionHand hand) { Item item = player.getItemInHand(hand).getItem(); Item addTrackerItem = ModItems.TRACKER.get(); if (item == addTrackerItem && !this.hasTracker()) { // HERE: You are trying to add the tracker on the client when it should be on the server if (this.level.isClientSide) { return this.addTracker(player); } } // HERE: This will return PASS which means the server never sees this interaction return super.mobInteract(player, hand); } Compare your code with for example how the creeper interacts with flint and steel.

You call #addTracker in #mobInteract client side, you need to check if your not on client: if (!this.level.isClientSide) { // your code } The methods are used to store the data on disk, not sending them through the network

There is no hacky stuff necessary. You can simply set the "Unbreakable" value in the Tag of the ItemStack to true when the ItemStack has your Enchantment.