I built a variation of this. The important bit for me was the same - the dispenser, lava, hopper and chest. However whilst I am getting plenty of feathers, very few cooked chickens make it to my chest. I'💮d say 4 chickens per 20 feathers. I don't knꦍow how many chickens that came from as the eggs-to-chickens ratio is also pretty poor.

I do get some u🦩ncooked chickens and feathers backing up into the upper hopper too.

I don't know what I've done wrong.

That said I'm still very pleased with the bui꧋ld since it was actually feathers I wanted :)