When I place doors and then leave the chunk or log out of the game and then return, a good portion of the doors I placed are gone, and the ones that remain are usually only showing the top or bottom halves. When I try to remove them they do not drop doors but all of the remaining "half doors" just disappear.

It has also removed doors from villages I visited and then returned to. I have seen it happen with wooden stairs as well (don't know if it is the same issue or different).

All the doors and stairs were the original oak wood.