playerIn.getHeldItem(handIn).shrink(1) not working

I have an item with the onItemRightClick. Then I check some stuff and then decide if I need to shrink the itemstack this is most of the time not working. Also now that I only execute it one's on the server side

Here is the code if you want to see more: https://github.com/DJ1TJOO/fantasy20/

@Override
	public ActionResult<ItemStack> onItemRightClick(World worldIn, PlayerEntity playerIn, Hand handIn) {
	      // System.err.println("A");
		if(worldIn.isRemote) {
		    return new ActionResult<>(ActionResultType.PASS, playerIn.getHeldItem(handIn));
		}
	       if(playerIn.getHeldItem(handIn).getItem() instanceof Blueprint) {
			   //System.err.println("a");
	    	   if(!playerIn.getHeldItem(handIn).hasTag()) {
	    		   return super.onItemRightClick(worldIn, playerIn, handIn);
	    	   }
	    	   CompoundNBT tag = playerIn.getHeldItem(handIn).getTag();
	    	   if(!tag.contains("data")) {
	    		   return super.onItemRightClick(worldIn, playerIn, handIn);
	    	   }
	    	   if(!tag.getCompound("data").contains("item")) {
	    		   return super.onItemRightClick(worldIn, playerIn, handIn);
	    	   }
	    	   String itemString = tag.getCompound("data").getString("item");
			   //System.err.println("b");
	    	   playerIn.getCapability(CapabilityResearchProvider.RESEARCH_CAPABILITY, null).ifPresent(r -> {
	    		  // System.err.println("c");
	    		   Item item = ForgeRegistries.ITEMS.getValue(ResourceLocation.create(itemString, ':'));
	    		  // System.err.println("d");
	    		   if(!r.getResearched().contains(item)) {
	    			   r.getResearched().add(item);
	    			   playerIn.sendMessage(new StringTextComponent("Je hebt het item " + item.getDefaultInstance().getDisplayName().getFormattedText() + " geresearched!"));
	    			   playerIn.getHeldItem(handIn).shrink(1);
	    			  // System.err.println(playerIn.serializeNBT().toString());
		    		   //System.err.println(r.getResearched().toString());
	    		   }
	    	   });
	       } 
	    return new ActionResult<>(ActionResultType.PASS, playerIn.getHeldItem(handIn));
		
	}