Villagers will constantly mess up path finding with hills and their beds/work stations.
If you have a bed/house ontop of a hill then dig into the hill they will walk into the mine instead of up the mountain. They don't take into consideration the height difference when path finding between them and the workstation/bed.
When there is a path off to the the side that is climbable by the villager it will be ignored and will jump at an impassible space for the "Optimal path" instead and become stuck.
They also get completely stuck on flower pots and cannot free themselves. (Head Height of villager, haven't tested leg height)
They also get stuck on-top of vines & ladders if climbed and cannot get down unless hit or ladder/vine is broken.
Villagers will walk out of range and get stuck trying to jump up too far (Block with slab on top) outside of their range of the work station and lose their profession.
Villagers will walk onto open campfires damaging themselves.
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Similar issue: MC-216626
They also jump off ledges that are more than 3 blocks tall and take fall damage, even when there is a staircase down 2 blocks away.
And they get stuck on mob heads as well.