[1.12.2] Observer spamming signals

Hi, I'm trying to fix an annoying bug of the observer in 1.12.2 pointing a water source that give a signal every 5 ticks.

So i made a copy of the original observer class and I'm trying to edit a bit the code to detect only when a water source is placed and when is taken.

I'm working on this method:

public void observedNeighborChanged(IBlockState state, World world, BlockPos pos, Block block, BlockPos fromPos) {
        if (!world.isRemote && pos.offset(state.getValue(FACING)).equals(fromPos)) {
            if(block.equals(Blocks.WATER)) {
                //More checks to do here
                return;
            }

            startSignal(state, world, pos);
        }
    }

but i don't see any difference that should trigger the observer.

Do you guys have any idea about? Do you know any better solution?

Any help is welcome, thanks