Drats, I just reread my original post and realised I messed up the actual order I did things in. This is to fix it, and again I'm sorry for the multiple posts.
Steps done to avoid the reset glitch
1. Used the club gathering feature to send my sims to a different lot.
2. Saved game
3. Went into world manager/editor to replace their home lot with one from the bin. The game rejected everything and gave the object not found error message.
4. Returned to the family while they were on the community lot and saved a second time.
*The game saves when we use the world manager and move our sims to a different lot. The game gives us no error message when it saves, but we always noticed the sims had been reset to an earlier save point. I suspect the problem is in entering the world manager to begin with, because at that point the sims are reset to the earlier save and the game won't give any other errors because there aren't any.*
5. Quit the game and restarted it.
6. The lot was still bulldozed, and the sims didn't lose any progress since I started the gathering.
The reason I mention this is because the world editor/manager feature is the one constant I had every time I ran into the reset glitch. Couldn't save the sims, so I entered the world manager and tried everything imaginable to create a new save. Clicking on another sim family and saving from their lot didn't work, nor did moving the sims around. They were always reset. Entering build mode and demolishing the lot had been a temp fix for the bugged object, or 533 error. It was the entering world manager that reset the sims and their lot back to an earlier save point.
By using the club gathering feature, I was able to move my sims off their bugged lot and to another without looking at the world map. The game saved as normal when they were on a different lot, so the reset bug isn't sim related. It's on the lot itself. The world manager triggers the reset, but it might not be the initial problem. I'm assuming it has a mechanism to reset/clean lots when you enter world edit mode, and if the lot is glitched it would revert back to an earlier save. That would affect your sims, and the lot itself.
I've noticed this constant in the many games I've played. A little more information on that ... I tend to create a new game every few days, and keep my legacy family stored in the library. The sims, their homes, and everything else gets installed in the new fresh game, and I keep playing until I hit the 533 reset bug. Once the bug starts, it becomes more frequent.
*** The following isn't bug related, but a quick post on binning legacy families without losing connections or relations***
- Bin the founder/ghost with their spouse and children, but don't include grandchildren.
- Bin each generation with their separate households.
1. Place the founder and their children on a lot.
2. Use the house editor function and move out the kids to create their own separate families
3. Open the newly created single sim family, and merge them with their household from your library file. *Sims in the library keep their traits, skills, and aspirations*
4. This creates a duplicate copy of the original sim. You'll end up having two Johnathans in your family, so delete the one you copied from the bin. You need to keep the original Johnathan, because he has a relationship with the founder. (You can avoid the duplicate by removing them from the family before you bin them, but absent mindedness and mistakes causes me to screw that up.)
5. Edit the relationships for the family. You can always add spouses and children in cas, but you can't modify a parental relationship without using the play with genetics feature. This is why you must add future wives and children after moving the original ones out from the founder's home. Do this with each generation, and you can complete the sim legacy family with all their connections.