Confirmed. Used the long tunnel method, the wither did not follow me so I had to brave being exposed to it, it killed me then when I went back to it the health bar disappeared. Hopefully when I go back I will be able to fight it properly or I will lose hours of hard work that I've put into my world, not good.
I can confirm this for beds, bottom slabs too. They disconnect from the workstation and their bed and just stand there.
They seem to have a big problem with doors sometimes too. I will have villagers stood outside a house with an empty bed, likely the one they have claimed and they just stare through the door window longingly at their bed because doors are too hard....
I have had this happen. I had used "bottom" slabs as a 2nd floor and wondered why my villagers were not moving, changed for top slabs and they were fine
Please see the video in this link to see the issue happening
https://youtu.be/wATAgSmNb_Q