So i saw a Sims YouTuber's video trying to save the Oldies family and at the near-end of the video, they had a glitch, after the Oldies both died and they revisited their lot, they now played as the Therapist. Does this bug cause corruption in your game? When they clicked unpause, their game crashed
Here's the link to the video https://youtu.be/fpSWvUobYXo?si=J5G2BWokyA4XlQNa CHAPTER NAME IS PROBABLY "the most cursed sims 2 gameplay ever"

And how did this bug even happen to them anyway?!?!

With AL, possibly just controlling them could modify objects.package, since the game would probably generate a new portrait for them, and obviously if you changed anything else about them that would ordinarily be stored in a character file that would change objects.package also. I don't know if just the portrait would actually cause any issues, but you can prevent this from happening by just marking objects.package as read-only and then it can never be changed by the game no matter what happens in it. After marking objects.package read-only you can add the remote control car to your family or do whatever other crazy shit you want to try and the only casualty of this will be probably just the neighborhood you do it in.

Oof... idk if this fellow man has Appartment life, but if he does, rest in peace to his game

It sounds like his game crashed and therefore did not save. I think as long as he didn't click save, nothing was written to any files.

You should tell him not to mess with universal NPC's because they are not actually sims, but objects in his install.

I keep a backup copy of objects.package. It's just a file after all.

Set to read-only.

Whenever I read about it I think "what if I don't have it in read-only" but yes, I did it years ago, I just checked it. xDD

Some NPCs modify Objects package immediately, like ideal plantsim. Something on their appearance causes an update. When you bring a plantbaby they spawn this neighbor for no reason. There is a different way of creating some of these NPCs using object instance from guid in Temp 0,1 instead of Neighbor in stack object. It's how crumplebottom is created. I allow this in my Tombstone if it's a NPC I know of.

he didn't mess with Universal Sims, He played with the Oldies but when he loaded their lot after both Coral and Herb's death, he found himself playing as the Therapist. Idk how it happened the only thing i saw when he clicked unpause, his game crashed

Just spawning a sim on a lot doesn't cause an update to objects.package or any other file.

Happens with the ideal plantsim. He is not a real, complete sim. I keep the objects package writable to detect when an update happens, which should be avoided at all costs in mods I make. I'm surprised that read-only actually allows the game to continue instead of causing an error.

I tested this. I made objects.package writable, went into the game, spawned a plantbaby, and quit without saving, and lo and behold, the last modified date on objects.package is still the same.

I used the old insimenator summoner box. The change in his clothes might be related to the clothes unlock that I have to permit young adults to become plantmen. But the ages have not been changed in this file, and are still equal to 8. And the Slot File has also been extended with one additional container slot. Perhaps it is for an attachment of later EPs. This is in FreeTime. I don't want to torture the game further and repeat the test in Mansion. He should not be spawned like this anyway. The "genetics" can be extracted from neighbor.

That does appear to have an effect, but that's different than what happens when you spawn a plantbaby, which doesn't do that. Probably it's something to do with rendering the 3D model, but nothing changes if he is spawned off-world.

Mansion. No mods. Clothes unlocker was never present in this test neighborhood.

Set Florence Delarosa to be a plantwoman to get a plantbaby without mods.

Load the fresh lot, select Grow Plantbaby.

Maybe your game is inside the Program Files directory and you don't have Administrator rights. Therefore the updated file goes into a virtual store. There is massive (on a Core 2 Duo), massive delay when this update happens because everything in the file gets updated and compressed.

It is in Program Files, but my game run as administrator since otherwise it has issues reading the graphics rules. It also had no trouble changing objects.package when I summoned ideal plantsim with the mod. But it did not change when the plantbaby was spawned, nor was there a huge delay when that happened.

Edit: Ok, I've now remembered that I have a multi-ideal-plantsim mod installed, I've forgotten because I don't really use plantsims that much. I do see that one of the character files for those custom sims was changed today, so I guess it is actually a thing. Regardless, just keeping objects.package read-only should solve the problem, and I don't think this kind of modification is actually dangerous. I'm also kind of interested in how you propose for the game to get the neighbor ID of ideal plantsim without spawning him.

If the objects.package is supposed to update when a plantbaby is spawned then what happens if you have it set to read only?

It just doesn't get edited.

I don't think anything will happen because it is not updated, the plant is still a sim and just another character file, the only thing it takes is the genetics from the ideal plant sim, right?

I do that, too, but some Windows versions change it on you, so I also have a backup. It's also good to use a backup/copy to open if I want to clone things from it.