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1.16.5 - Custom Light Block is not working when using optifine


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I created a light emitting block which works when I'm not using optifine.

After I run it with optifine the block is not emitting any light. Could someone help me how to solve it? Thanks!

	public LightModel(Properties properties) {
	this.setDefaultState(this.stateContainer.getBaseState().with(LIT, Boolean.valueOf(true)).with(WATERLOGGED, Boolean.valueOf(false)));

    public int getLightValue(BlockState state, IBlockReader world, BlockPos pos) {
        Boolean i = state.get(LIT);   
        if (i == true) {
        	return 15;
        } else {
		return 0;
    } }

    public ActionResultType onBlockActivated(BlockState state, World worldIn, BlockPos pos, PlayerEntity player, Hand handIn, BlockRayTraceResult hit) {
    	    if (Screen.hasShiftDown() == true) 
    	           state = state.func_235896_a_(LIT);
    	           worldIn.setBlockState(pos, state, 10);
    	       } else {
    	    	     return ActionResultType.PASS;
    	 return ActionResultType.func_233537_a_(worldIn.isRemote);


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