Please use this thread going forward: Save Game Corruption (Disappearing Lots/Error 800 or 801) | EA Forums - 5037272
Same save and all of my other placed lots are there. I was working with all sims evicted so not sure about the families.
Sorry, I don't access the computer regularly. They were replaced ages ago and suddenly revert bag after logging into the game. This is the only time it has happened so I understand it may not be solveable. But to put the information out there, the families were removed but did not get reverted back when the lot did. The lot traits I added also remained the same. Only the build changed.
Do you still have any of the automatic backups to see if those still work ?
Best is to backup your saves folder, then recover some of the old ones to see if it's the same: https://sims4.crinrict.com/eng/2014/09/save-games/#wiederherstellen
It could be related to this issue: https://answers.ea.com/t5/Bug-Reports/OPEN-Houses-Lots-disappear/m-p/4620279
Did some revert to empty lots ?
I tried loading an earlier save and working off that but eventually the same thing happened. I am going to just write down which lots I used and start over with a new save. Thank you for the help!
