I have a  few villagers in 1x2 holes that I have traded with many times. Some of them restock twice a day as expected, but others just don't restock at all. The villagers in question haven't restocked in 20-50 in-game days. They have direct access to their workstation which is directly below them. I have an armorer villager who is my newest that won't restock trades. I made his workstation directly next to him with one block over the blast furnace (2x2 hole) and it still won't restock after numerous hours of afk'ing next to him and purchasing other trades until they are out of stock. (All villagers were once zombie villagers that were cured)