Cannot equip carved pumpkin on zombie villager via dispenser

I tried to exuip a carved pumpkin on a zombie villager (farmer profession) with a dispenser but it failed. It did work in mc 1.14 but not in 1.14.1. It is on a server of which I don't know the exact specifications but, if necessary, I could ask.

 

UPDATE: still relevant in 1.14.2. I did some additional testing as well, which can be seen in the attachment below.