I logged into my world, and I played early today, to then see that most of my house has gone to the original untouched land which made me think that my world reset, however, part of my house and stuff in chests were still the same from earlier today and my farm was kept untouched also. this has hugely confused and frustrated me as I spent a lot of time creating my underground part of my house to then have it disappear to be exactly how I started. ive been playing on this world for many days and haven't had any bugs like this before. I'm not sure if I can fix this issue which is hugely disappointing. Sent attachment of what it looks like.