Villagers equipped with armor don’t drop the armor when killed.

I was playing on my server I made for me and my friends and I turned a villager into a zombie villager but It killed me and picked up all my armor including my elytra. I was expecting it to drop my items when it changed back into a villager but it didn’t so I learned that villagers can wear armor so I killed it to get my armor back but it didn’t drop it.