I use tall 1x1 wood fences as lantern posts. Rarely, Villagers can be seen freezing completely in this spot, not doing anything and eventually unlinking from their job sites. After a push away from the fence, they eventually start moving again. It seems that certain non-full blocks such as fences can ruin their pathfinding AI. This info might be unrelated, but there's a leashed Iron Golem in that fence.