Bonemeal in dispenser won't make trees grow

I have this simplistic semi automatic tree farm that is activated with a lever (see link:https://www.youtube.com/watch?v=6quRrXne_DA) and decided to give it a go with the new update but the dispenser is spewing out the bonemeal but there is no particle animation. The bonemeal is gone and the saplings never grew, tested in both creative and survival and also manually which worked just fine.