u get in a server and ur doors are top open bottom closed and when u open them they switch u cant get thru but other players see them open and they can  i got the same bug that this lady  https://youtu.be/tXABkNesT-M and its making any door just a barier u cant get thru 

on the server with iron door the top door never even opened 

i tried to reinstall a cupple of times but it didnt help