Villagers stopped pathfinding when standing on a bottom half slab (or bed) when there is nothing underneath.

  There were no issues for the first couple of hours.  Then they just stopped moving.  I had not changed anything from the time they were working correctly to when they stopped.  I moved to another world to try again and had the same issue from the start.  I was able to get them moving again by replacing the slabs with full blocks and placing the beds on top of full blocks.

Not sure I have the version above correct.  When I check the info on my ps4 it says version 2.05, but there is no option for that.