When 1.16 dropped, I tested to see if a villager would reduce the prices when doing the zombie villager conversion trick. It worked, then I did it with one of my main villagers in my trading center, and it ended up reducing the prices of 9 of the villagers instead of just the one.
The video of this is too large to post here, but here's a link to it on YouTube: https://youtu.be/ot_hIJA-NAg