It looks like others have reported this bug, but I am still experiencing it.  I have lost a few hours cumulatively of gameplay over the last few days,  I will log out of my realm, log in a bit later will go back to a previous time I had logged out.  It has been happening sporadically, with no pattern that I can find.  Sometimes it happens, sometimes it does not.  Switching between the nether and overworld doesn't have an impact that I can find either.  I hope this problem can be resolved soon, I have both lost time that I have played, and am hesitant to play again due to this, despite paying money for the realm.  Thank you